Description of Business and Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation — The consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC") and, in the opinion of management, include all adjustments necessary for a fair presentation of the results of operations, comprehensive income, financial position and cash flows for each period presented.
Basis of Consolidation	Basis of Consolidation — The consolidated financial statements include the consolidated accounts of Cincinnati Bell Inc. and its majority-owned subsidiaries over which it exercises control. Intercompany accounts and transactions have been eliminated in the consolidated financial statements. Investments over which the Company exercises significant influence are recorded under the equity method. Investments in which we own less than 20% of the ownership interests and cannot exercise significant influence over the investee’s operations are recorded at cost.
Discontinued Operations, Policy [Policy Text Block]	Recast of Financial Information for Discontinued Operations — In the second quarter of 2014, we entered into agreements to sell our wireless spectrum licenses and certain other assets related to our wireless business. The agreement to sell our wireless spectrum licenses closed on September 30, 2014, for cash proceeds of $194.4 million. Simultaneously, we entered into a separate agreement to use certain spectrum licenses for $8.00 until we no longer provided wireless service. Effective March 31, 2015, all wireless subscribers were migrated off our network and we ceased providing wireless services and operations. Certain wireless tower lease obligations and other assets were transferred to the acquiring company on April 1, 2015. The closing of our wireless operations represents a strategic shift in our business. Therefore, certain wireless assets, liabilities and results of operations are reported as discontinued operations in our financial statements. Accordingly, the Company recast its prior period results to be comparable with the current discontinued operations presentation with the exception of the Consolidated Statements of Comprehensive Income, Consolidated Statements of Shareowners' Deficit and Consolidated Statements of Cash Flows. See Note 3 for all required disclosures.
Use of Estimates	Use of Estimates — The preparation of financial statements in conformity with generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates. Significant items subject to such estimates and judgments include: the carrying value of property, plant and equipment; the valuation of insurance and claims liabilities; the valuation of allowances for receivables and deferred income taxes; reserves recorded for income tax exposures; the valuation of asset retirement obligations; assets and liabilities related to employee benefits; and the valuation of goodwill. In the normal course of business, the Company is also subject to various regulatory and tax proceedings, lawsuits, claims and other matters. The Company believes adequate provision has been made for all such asserted and unasserted claims in accordance with GAAP. Such matters are subject to many uncertainties and outcomes that are not predictable with assurance.
Cash and Cash Equivalents	Cash and Cash Equivalents — Cash consists of funds held in bank accounts. Cash equivalents consist of short-term, highly liquid investments with original maturities of three months or less.
Receivables	Receivables — Receivables consist principally of trade receivables from customers and are generally unsecured and due within 21 - 90 days. The Company has receivables with one large customer, General Electric Corp. ("GE"), that makes up 22% and 26% of the outstanding accounts receivable balance at December 31, 2015 and 2014, respectively. Unbilled receivables arise from services rendered but not yet billed. As of December 31, 2015 and 2014, unbilled receivables totaled $14.0 million and $13.2 million, respectively. Expected credit losses related to trade receivables are recorded as an allowance for uncollectible accounts in the Consolidated Balance Sheets. The Company establishes the allowances for uncollectible accounts using percentages of aged accounts receivable balances to reflect the historical average of credit losses as well as specific provisions for certain identifiable, potentially uncollectible balances. When internal collection efforts on accounts have been exhausted, the accounts are written off and the associated allowance for uncollectible accounts is reduced.
Inventory, Materials and Supplies	Inventory, Materials and Supplies — Inventory, materials and supplies consists of network components, various telephony and IT equipment to be sold to customers, wireless handsets and accessories to support our agreement with Verizon to sell their products and services in our retail stores, maintenance inventories, and other materials and supplies, which are carried at the lower of average cost or market.
Property, Plant and Equipment	Property, Plant and Equipment — Property, plant and equipment is stated at original cost and presented net of accumulated depreciation and impairment losses. Maintenance and repairs are charged to expense as incurred while improvements which extend an asset's useful life or increase its functionality are capitalized and depreciated over the asset's remaining life. The majority of the Entertainment and Communications network property, plant and equipment used to generate its voice and data revenue is depreciated using the group method, which develops a depreciation rate annually based on the average useful life of a specific group of assets rather than for each individual asset as would be utilized under the unit method. Provision for depreciation of other property, plant and equipment, except for leasehold improvements, is based on the straight-line method over the estimated economic useful life. Depreciation of leasehold improvements is based on a straight-line method over the lesser of the economic useful life of the asset or the term of the lease, including optional renewal periods if renewal of the lease is reasonably assured. Additions and improvements, including interest and certain labor costs incurred during the construction period, are capitalized. The Company records the fair value of a legal liability for an asset retirement obligation in the period it is incurred. The estimated removal cost is initially capitalized and depreciated over the remaining life of the underlying asset. The associated liability is accreted to its present value each period. Once the obligation is ultimately settled, any difference between the final cost and the recorded liability is recognized as gain or loss on disposition.
Goodwill and Indefinite-Lived Intangible Assets	Goodwill — Goodwill represents the excess of the purchase price consideration over the fair value of net assets acquired and recorded in connection with business acquisitions. Goodwill is generally allocated to reporting units one level below business segments. Goodwill is tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired. If the net book value of the reporting unit exceeds its fair value, an impairment loss may be recognized. An impairment loss is measured as the excess of the carrying value of goodwill of a reporting unit over its implied fair value. The implied fair value of goodwill represents the difference between the fair value of the reporting unit and the fair value of all the assets and liabilities of that unit, including any unrecognized intangible assets.
Long-Lived Assets	Long-Lived Assets — Management reviews the carrying value of property, plant and equipment and other long-lived assets, including intangible assets with definite lives, when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. An impairment loss is recognized when the estimated future undiscounted cash flows expected to result from the use of an asset (or group of assets) and its eventual disposition is less than its carrying amount. An impairment loss is measured as the amount by which the asset’s carrying value exceeds its estimated fair value. Long-lived intangible assets are amortized based on the estimated economic value generated by the asset in future years.
Equity Method Investments	Equity Method Investments - On January 24, 2013, we completed the initial public offering ("IPO") of CyrusOne Inc. ("CyrusOne"), which owns and operates our former Data Center Colocation business. CyrusOne conducts its data center business through CyrusOne LP, an operating partnership. Effective with the IPO, we retained ownership of approximately 1.9 million shares, or 8.6%, of CyrusOne's common stock and were a limited partner in CyrusOne LP, owning approximately 42.6 million, or 66%, of its partnership units. We effectively owned 69% of CyrusOne and continued to have significant influence over the entity, but we did not control its operations. Therefore, effective January 24, 2013, we no longer included the accounts of CyrusOne in our consolidated financial statements, but accounted for our ownership in CyrusOne as an equity method investment. From the date of IPO, we recognized our proportionate share of CyrusOne's net income or loss as non-operating income or expense in our Consolidated Statement of Operations through December 31, 2015. For the period January 1, 2013 through January 23, 2013, we consolidated CyrusOne's operating results. We completed the sale of 16.0 million partnership units of CyrusOne LP to CyrusOne Inc. at a price of $22.26 per unit in the second quarter of 2014. In the second quarter of 2015, we consummated the sale of 14.3 million operating partnership units of CyrusOne LP to CyrusOne, Inc. at a price of $29.88 per unit for proceeds of $426.0 million. On July 1, 2015, we sold 6.0 million operating partnership units of CyrusOne LP to CyrusOne, Inc. at a price of $28.41 per unit for proceeds of $170.3 million. In December 2015, we sold 1.4 million shares of CyrusOne's common stock at a price of $35.30 per share for proceeds of $47.6 million. For the year ended December 31, 2015, 2014 and 2013, the Company received cash dividends from CyrusOne totaling $22.2 million, $28.4 million and $21.3 million, respectively. Dividends from CyrusOne are recognized as a reduction of our investment. Effective December 31, 2015 we exchanged our remaining 6.3 million operating partnership units in CyrusOne LP for an equal number of newly issued shares of common stock of CyrusOne Inc. As a result, we own approximately 9.5% of CyrusOne's common shares and no longer have significant influence over the entity. Therefore, as of December 31, 2015, our ownership in CyrusOne is accounted for as a cost method investment. During 2014, we invested a total of $5.5 million in other entities, which are accounted for as equity method investments and the carrying value has been recorded within “Other noncurrent assets” in the Consolidated Balance Sheets. The Company's proportionate share of the investments’ net loss had a minimal impact on our Consolidated Statement of Operations. Our equity method investments are tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired.
Cost Method Investments	Cost Method Investments — Effective December 31, 2015 our investment in CyrusOne is accounted for as a cost method investment. The carrying value of this investment was 55.5 million as of December 31, 2015. Our cost method investments are tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired.
Leases	Leases — Certain property and equipment are leased. At lease inception, the lease terms are assessed to determine if the transaction should be classified as a capital or operating lease.
Treasury Shares	Treasury Shares — The repurchase of common shares is recorded at purchase cost as treasury shares. Our policy is to retire, either formally or constructively, treasury shares that management anticipates will not be reissued. Upon retirement, the purchase cost of the treasury shares that exceeds par value is recorded as a reduction to “Additional paid-in capital” in the Consolidated Balance Sheets.
Revenue Recognition	Revenue Recognition — We apply the revenue recognition principles described in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic ("ASC") 605, “Revenue Recognition.” Under ASC 605, revenue is recognized when there is persuasive evidence of a sale arrangement, delivery has occurred or services have been rendered, the sales price is fixed or determinable, and collectability is reasonably assured. With respect to arrangements with multiple deliverables, management determines whether more than one unit of accounting exists in an arrangement. To the extent that the deliverables are separable into multiple units of accounting, total consideration is allocated to the individual units of accounting based on their relative fair value, determined by the price of each deliverable when it is regularly sold on a stand-alone basis. Revenue is recognized for each unit of accounting as delivered, or as service is performed, depending on the nature of the deliverable comprising the unit of accounting. The Company has sales with one large customer, GE, that contributed 12% to total revenue in 2015 and 14% in 2014. Revenue derived from foreign operations is approximately 1% of consolidated revenue. Entertainment and Communications — Revenues from local telephone, special access, internet product and video services, which are billed monthly prior to performance of service, are not recognized upon billing or cash receipt but rather are deferred until the service is provided. Long distance, switched access and other usage based charges are billed monthly in arrears. Entertainment and Communications bills service revenue in regular monthly cycles, which are spread throughout the days of the month. As the last day of each billing cycle rarely coincides with the end of the reporting period for usage-based services such as long distance and switched access, we must estimate service revenues earned but not yet billed. These estimates are based upon historical usage, and we adjust these estimates during the period in which actual usage is determinable, typically in the following reporting period. Initial billings for Entertainment and Communications service connection and activation are deferred and amortized into revenue on a straight-line basis over the average customer life. The associated connection and activation costs, to the extent of the upfront fees, are also deferred and amortized on a straight-line basis over the average customer life. Pricing of local voice services is generally subject to oversight by both state and federal regulatory commissions. Such regulation also covers services, competition, and other public policy issues. Various regulatory rulings and interpretations could result in increases or decreases to revenue in future periods. IT Services and Hardware — Services are generally recognized as the service is provided. Maintenance on telephony equipment is deferred and recognized ratably over the term of the underlying customer contract, generally one to three years. Equipment revenue is recognized upon the completion of our contractual obligations, such as shipment, delivery, or customer acceptance. Installation service revenue is generally recognized when installation is complete. We sell equipment and installation services on both a combined and standalone basis. The Company is a reseller of IT and telephony equipment. For these transactions, we consider the gross versus net revenue recording criteria of ASC 605. Based on this criteria, these equipment revenues and associated costs have generally been recorded on a gross basis rather than recording the revenues net of the associated costs. Vendor rebates are earned on certain equipment sales. When the rebate is earned and the amount is determinable, we recognize the rebate as an offset to cost of products sold. Discontinued Operations — Postpaid wireless and reciprocal compensation were billed monthly in arrears. Service revenue was billed in regular monthly cycles, which were spread throughout the days of the month. As the last day of each billing cycle rarely coincided with the end of the reporting period for usage-based services such as postpaid wireless, we estimated service revenues earned but not yet billed. Our estimates were based upon historical usage, and we adjusted these estimates during the period in which actual usage was determinable, typically in the following reporting period. Revenue from prepaid wireless service, which was collected in advance, was not recognized upon billing or cash receipt but rather deferred until the service was provided. Wireless handset revenue and the related activation revenue were recognized when the products were delivered to and accepted by the customer, as this was considered to be a separate earnings process from the sale of wireless services. Wireless equipment costs were also recognized upon handset sale and were generally in excess of the related handset and activation revenue. Revenue from termination fees was recognized when collection was deemed reasonably assured.
Advertising Expenses	Advertising Expenses — Costs related to advertising are expensed as incurred. Advertising costs were $8.3 million, $7.2 million, and $7.3 million in 2015, 2014, and 2013, respectively.
Legal Expenses	Legal Expenses — In the normal course of business, the Company is involved in various claims and legal proceedings. Legal costs incurred in connection with loss contingencies are expensed as incurred. Legal claim accruals are recorded once determined to be both probable and estimable.
Income Taxes	Income taxes — The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as various foreign, state and local jurisdictions. The provision for income taxes is based upon income in the consolidated financial statements, rather than amounts reported on the income tax return. The income tax provision consists of an amount for taxes currently payable and an amount for tax consequences deferred to future periods. Deferred investment tax credits are amortized as a reduction of the provision for income taxes over the estimated useful lives of the related property, plant and equipment. Deferred income taxes are provided for temporary differences between financial statement and income tax assets and liabilities. Deferred income taxes are recalculated annually at rates then in effect. Valuation allowances are recorded to reduce deferred tax assets to amounts that are more likely than not to be realized. The ultimate realization of the deferred income tax assets depends upon the ability to generate future taxable income during the periods in which basis differences and other deductions become deductible and prior to the expiration of the net operating loss carryforwards. Previous tax filings are subject to normal reviews by regulatory agencies until the related statute of limitations expires.
Operating Taxes	Operating taxes — Certain operating taxes such as property, sales, use, and gross receipts taxes are reported as expenses in operating income primarily within cost of services. These taxes are not included in income tax expense because the amounts to be paid are not dependent on our level of income. Liabilities for audit exposures are established based on management's assessment of the probability of payment. The provision for such liabilities is recognized as either property, plant and equipment, operating tax expense, or depreciation expense depending on the nature of the audit exposure. Upon resolution of an audit, any remaining liability not paid is released against the account in which it was originally recorded.
Regulatory Taxes	Regulatory taxes — The Company incurs federal and state regulatory taxes on certain revenue producing transactions. We are permitted to recover certain of these taxes by billing the customer; however, collections cannot exceed the amount due to the federal regulatory agency. These federal regulatory taxes are presented in sales and cost of services on a gross basis because, while the Company is required to pay the tax, it is not required to collect the tax from customers and, in fact, does not collect the tax from customers in certain instances. The amounts recorded as revenue for 2015, 2014, and 2013 were $15.5 million, $15.2 million, and $14.9 million, respectively. The amounts expensed for 2015, 2014, and 2013 were $17.9 million, $16.4 million, and $14.9 million, respectively. We record all other federal taxes collected from customers on a net basis.
Stock-Based Compensation	Stock-Based Compensation — Compensation cost is recognized for all share-based awards to employees and non-employee directors. We value all share-based awards to employees at fair value on the date of grant and expense this amount over the required service period, generally defined as the applicable vesting period. For awards which contain a performance condition, compensation expense is recognized over the service period, when achievement of the performance condition is deemed probable. The fair value of stock options and stock appreciation rights is determined using the Black-Scholes option-pricing model using assumptions such as volatility, risk-free interest rate, holding period and dividends. The fair value of stock awards is based on the Company’s closing share price on the date of grant. For all share-based payments, an assumption is also made for the estimated forfeiture rate based on the historical behavior of employees. The forfeiture rate reduces the total fair value of the awards to be recognized as compensation expense. Our accounting policy for graded vesting awards is to recognize compensation expense on a straight-line basis over the vesting period. We have also granted employee awards to be ultimately paid in cash which are indexed to the change in the Company’s common stock price. These awards are adjusted to the fair value of the Company's common stock, and the adjusted fair value is expensed on a pro-rata basis over the vesting period. When an award is granted to an employee who is retirement eligible, the compensation cost is recognized over the service period up to the date that the employee first becomes eligible to retire.
Pension and Postretirement Benefit Plans	Pension and Postretirement Benefit Plans — The Company maintains qualified and non-qualified defined benefit pension plans, and also provides postretirement healthcare and life insurance benefits for eligible employees. We recognize the overfunded or underfunded status of the defined benefit pension and other postretirement benefit plans as either an asset or liability. Changes in the funded status of these plans are recognized as a component of comprehensive income (loss) in the year they occur. Pension and postretirement healthcare and life insurance benefits earned during the year and interest on the projected benefit obligations are accrued and recognized currently in net periodic benefit cost. Prior service costs and credits are amortized over the average life expectancy of participants or remaining service period, based upon whether plan participants are mostly retirees or active employees. Net gains or losses resulting from differences between actuarial experience and assumptions or from changes in actuarial assumptions are recognized as a component of annual net periodic benefit cost. Unrecognized actuarial gains or losses that exceed 10% of the projected benefit obligation are amortized on a straight-line basis over the average remaining service life of active employees for the pension and bargained postretirement plans (approximately 9-13 years) and average life expectancy of retirees for the management postretirement plan (approximately 17 years).
Business Combinations	Business Combinations — In accounting for business combinations, we apply the accounting requirements of ASC 805, “Business Combinations,” which requires the recording of net assets of acquired businesses at fair value. In developing estimates of fair value of acquired assets and assumed liabilities, management analyzes a variety of factors including market data, estimated future cash flows of the acquired operations, industry growth rates, current replacement cost for fixed assets, and market rate assumptions for contractual obligations. Such a valuation requires management to make significant estimates and assumptions, particularly with respect to the intangible assets. In addition, contingent consideration is presented at fair value at the date of acquisition. Transaction costs are expensed as incurred.
Fair Value Measurements	Fair Value Measurements — Fair value of financial and non-financial assets and liabilities is defined as the price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value is utilized to measure certain investments on a recurring basis. Fair value measurements are also utilized to determine the initial value of assets and liabilities acquired in a business combination, to perform impairment tests, and for disclosure purposes. Management uses quoted market prices and observable inputs to the maximum extent possible when measuring fair value. In the absence of quoted market prices or observable inputs, fair value is determined using valuation models that incorporate assumptions that a market participant would use in pricing the asset or liability. Fair value measurements are classified within one of three levels, which prioritize the inputs used in the methodologies of measuring fair value for assets and liabilities, as follows: Level 1 — Quoted market prices for identical instruments in an active market; Level 2 — Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs); and Level 3 — Unobservable inputs that reflect management's determination of assumptions that market participants would use in pricing the asset or liability. These inputs are developed based on the best information available, including our own data.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions — The financial position of foreign subsidiaries is translated at the exchange rates in effect at the end of the period, while revenues and expenses are translated at average rates of exchange during the period. Gains or losses from translation of foreign operations where the local currency is the functional currency are included as components of accumulated other comprehensive income (loss). Gains and losses arising from foreign currency transactions are recorded in other income (expense) in the period incurred.
Earnings Per Common Share	Basic earnings per common share ("EPS") is based upon the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that would occur upon issuance of common shares for awards under stock-based compensation plans, exercise of warrants, or conversion of preferred stock, but only to the extent that they are considered dilutive.
Fair Value of Financial Instruments	The fair value of our investment in CyrusOne was based on the closing market price of CyrusOne's common stock on December 31, 2015 and 2014. This fair value measurement is considered Level 1 of the fair value hierarchy. The fair value of debt instruments was based on closing or estimated market prices of the Company’s debt at December 31, 2015 and 2014, which is considered Level 2 of the fair value hierarchy.

Description of Business and Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation — The consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC") and, in the opinion of management, include all adjustments necessary for a fair presentation of the results of operations, comprehensive income, financial position and cash flows for each period presented.

Basis of Consolidation

Basis of Consolidation — The consolidated financial statements include the consolidated accounts of Cincinnati Bell Inc. and its majority-owned subsidiaries over which it exercises control. Intercompany accounts and transactions have been eliminated in the consolidated financial statements. Investments over which the Company exercises significant influence are recorded under the equity method. Investments in which we own less than 20% of the ownership interests and cannot exercise significant influence over the investee’s operations are recorded at cost.

Discontinued Operations, Policy [Policy Text Block]

Recast of Financial Information for Discontinued Operations — In the second quarter of 2014, we entered into agreements to sell our wireless spectrum licenses and certain other assets related to our wireless business. The agreement to sell our wireless spectrum licenses closed on September 30, 2014, for cash proceeds of $194.4 million. Simultaneously, we entered into a separate agreement to use certain spectrum licenses for $8.00 until we no longer provided wireless service. Effective March 31, 2015, all wireless subscribers were migrated off our network and we ceased providing wireless services and operations. Certain wireless tower lease obligations and other assets were transferred to the acquiring company on April 1, 2015.

The closing of our wireless operations represents a strategic shift in our business. Therefore, certain wireless assets, liabilities and results of operations are reported as discontinued operations in our financial statements. Accordingly, the Company recast its prior period results to be comparable with the current discontinued operations presentation with the exception of the Consolidated Statements of Comprehensive Income, Consolidated Statements of Shareowners' Deficit and Consolidated Statements of Cash Flows. See Note 3 for all required disclosures.

Use of Estimates

Use of Estimates — The preparation of financial statements in conformity with generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates. Significant items subject to such estimates and judgments include: the carrying value of property, plant and equipment; the valuation of insurance and claims liabilities; the valuation of allowances for receivables and deferred income taxes; reserves recorded for income tax exposures; the valuation of asset retirement obligations; assets and liabilities related to employee benefits; and the valuation of goodwill. In the normal course of business, the Company is also subject to various regulatory and tax proceedings, lawsuits, claims and other matters. The Company believes adequate provision has been made for all such asserted and unasserted claims in accordance with GAAP. Such matters are subject to many uncertainties and outcomes that are not predictable with assurance.

Cash and Cash Equivalents

Cash and Cash Equivalents — Cash consists of funds held in bank accounts. Cash equivalents consist of short-term, highly liquid investments with original maturities of three months or less.

Receivables

Receivables — Receivables consist principally of trade receivables from customers and are generally unsecured and due within 21 - 90 days. The Company has receivables with one large customer, General Electric Corp. ("GE"), that makes up 22% and 26% of the outstanding accounts receivable balance at December 31, 2015 and 2014, respectively. Unbilled receivables arise from services rendered but not yet billed. As of December 31, 2015 and 2014, unbilled receivables totaled $14.0 million and $13.2 million, respectively. Expected credit losses related to trade receivables are recorded as an allowance for uncollectible accounts in the Consolidated Balance Sheets. The Company establishes the allowances for uncollectible accounts using percentages of aged accounts receivable balances to reflect the historical average of credit losses as well as specific provisions for certain identifiable, potentially uncollectible balances. When internal collection efforts on accounts have been exhausted, the accounts are written off and the associated allowance for uncollectible accounts is reduced.

Inventory, Materials and Supplies

Inventory, Materials and Supplies — Inventory, materials and supplies consists of network components, various telephony and IT equipment to be sold to customers, wireless handsets and accessories to support our agreement with Verizon to sell their products and services in our retail stores, maintenance inventories, and other materials and supplies, which are carried at the lower of average cost or market.

Property, Plant and Equipment

Property, Plant and Equipment — Property, plant and equipment is stated at original cost and presented net of accumulated depreciation and impairment losses. Maintenance and repairs are charged to expense as incurred while improvements which extend an asset's useful life or increase its functionality are capitalized and depreciated over the asset's remaining life. The majority of the Entertainment and Communications network property, plant and equipment used to generate its voice and data revenue is depreciated using the group method, which develops a depreciation rate annually based on the average useful life of a specific group of assets rather than for each individual asset as would be utilized under the unit method. Provision for depreciation of other property, plant and equipment, except for leasehold improvements, is based on the straight-line method over the estimated economic useful life. Depreciation of leasehold improvements is based on a straight-line method over the lesser of the economic useful life of the asset or the term of the lease, including optional renewal periods if renewal of the lease is reasonably assured.

Additions and improvements, including interest and certain labor costs incurred during the construction period, are capitalized. The Company records the fair value of a legal liability for an asset retirement obligation in the period it is incurred. The estimated removal cost is initially capitalized and depreciated over the remaining life of the underlying asset. The associated liability is accreted to its present value each period. Once the obligation is ultimately settled, any difference between the final cost and the recorded liability is recognized as gain or loss on disposition.

Goodwill and Indefinite-Lived Intangible Assets

Goodwill — Goodwill represents the excess of the purchase price consideration over the fair value of net assets acquired and recorded in connection with business acquisitions. Goodwill is generally allocated to reporting units one level below business segments. Goodwill is tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired. If the net book value of the reporting unit exceeds its fair value, an impairment loss may be recognized. An impairment loss is measured as the excess of the carrying value of goodwill of a reporting unit over its implied fair value. The implied fair value of goodwill represents the difference between the fair value of the reporting unit and the fair value of all the assets and liabilities of that unit, including any unrecognized intangible assets.

Long-Lived Assets

Long-Lived Assets — Management reviews the carrying value of property, plant and equipment and other long-lived assets, including intangible assets with definite lives, when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. An impairment loss is recognized when the estimated future undiscounted cash flows expected to result from the use of an asset (or group of assets) and its eventual disposition is less than its carrying amount. An impairment loss is measured as the amount by which the asset’s carrying value exceeds its estimated fair value. Long-lived intangible assets are amortized based on the estimated economic value generated by the asset in future years.

Equity Method Investments

Equity Method Investments - On January 24, 2013, we completed the initial public offering ("IPO") of CyrusOne Inc. ("CyrusOne"), which owns and operates our former Data Center Colocation business. CyrusOne conducts its data center business through CyrusOne LP, an operating partnership. Effective with the IPO, we retained ownership of approximately 1.9 million shares, or 8.6%, of CyrusOne's common stock and were a limited partner in CyrusOne LP, owning approximately 42.6 million, or 66%, of its partnership units. We effectively owned 69% of CyrusOne and continued to have significant influence over the entity, but we did not control its operations. Therefore, effective January 24, 2013, we no longer included the accounts of CyrusOne in our consolidated financial statements, but accounted for our ownership in CyrusOne as an equity method investment. From the date of IPO, we recognized our proportionate share of CyrusOne's net income or loss as non-operating income or expense in our Consolidated Statement of Operations through December 31, 2015. For the period January 1, 2013 through January 23, 2013, we consolidated CyrusOne's operating results.

We completed the sale of 16.0 million partnership units of CyrusOne LP to CyrusOne Inc. at a price of $22.26 per unit in the second quarter of 2014. In the second quarter of 2015, we consummated the sale of 14.3 million operating partnership units of CyrusOne LP to CyrusOne, Inc. at a price of $29.88 per unit for proceeds of $426.0 million. On July 1, 2015, we sold 6.0 million operating partnership units of CyrusOne LP to CyrusOne, Inc. at a price of $28.41 per unit for proceeds of $170.3 million. In December 2015, we sold 1.4 million shares of CyrusOne's common stock at a price of $35.30 per share for proceeds of $47.6 million.

For the year ended December 31, 2015, 2014 and 2013, the Company received cash dividends from CyrusOne totaling $22.2 million, $28.4 million and $21.3 million, respectively. Dividends from CyrusOne are recognized as a reduction of our investment. Effective December 31, 2015 we exchanged our remaining 6.3 million operating partnership units in CyrusOne LP for an equal number of newly issued shares of common stock of CyrusOne Inc. As a result, we own approximately 9.5% of CyrusOne's common shares and no longer have significant influence over the entity. Therefore, as of December 31, 2015, our ownership in CyrusOne is accounted for as a cost method investment.

During 2014, we invested a total of $5.5 million in other entities, which are accounted for as equity method investments and the carrying value has been recorded within “Other noncurrent assets” in the Consolidated Balance Sheets. The Company's proportionate share of the investments’ net loss had a minimal impact on our Consolidated Statement of Operations.

Our equity method investments are tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired.

Cost Method Investments

Cost Method Investments — Effective December 31, 2015 our investment in CyrusOne is accounted for as a cost method investment. The carrying value of this investment was 55.5 million as of December 31, 2015. Our cost method investments are tested for impairment on an annual basis or when events or changes in circumstances indicate that such assets may be impaired.

Leases

Leases — Certain property and equipment are leased. At lease inception, the lease terms are assessed to determine if the transaction should be classified as a capital or operating lease.

Treasury Shares

Treasury Shares — The repurchase of common shares is recorded at purchase cost as treasury shares. Our policy is to retire, either formally or constructively, treasury shares that management anticipates will not be reissued. Upon retirement, the purchase cost of the treasury shares that exceeds par value is recorded as a reduction to “Additional paid-in capital” in the Consolidated Balance Sheets.

Revenue Recognition

Revenue Recognition — We apply the revenue recognition principles described in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic ("ASC") 605, “Revenue Recognition.” Under ASC 605, revenue is recognized when there is persuasive evidence of a sale arrangement, delivery has occurred or services have been rendered, the sales price is fixed or determinable, and collectability is reasonably assured.

With respect to arrangements with multiple deliverables, management determines whether more than one unit of accounting exists in an arrangement. To the extent that the deliverables are separable into multiple units of accounting, total consideration is allocated to the individual units of accounting based on their relative fair value, determined by the price of each deliverable when it is regularly sold on a stand-alone basis. Revenue is recognized for each unit of accounting as delivered, or as service is performed, depending on the nature of the deliverable comprising the unit of accounting.

The Company has sales with one large customer, GE, that contributed 12% to total revenue in 2015 and 14% in 2014. Revenue derived from foreign operations is approximately 1% of consolidated revenue.

Entertainment and Communications — Revenues from local telephone, special access, internet product and video services, which are billed monthly prior to performance of service, are not recognized upon billing or cash receipt but rather are deferred until the service is provided. Long distance, switched access and other usage based charges are billed monthly in arrears. Entertainment and Communications bills service revenue in regular monthly cycles, which are spread throughout the days of the month. As the last day of each billing cycle rarely coincides with the end of the reporting period for usage-based services such as long distance and switched access, we must estimate service revenues earned but not yet billed. These estimates are based upon historical usage, and we adjust these estimates during the period in which actual usage is determinable, typically in the following reporting period.

Initial billings for Entertainment and Communications service connection and activation are deferred and amortized into revenue on a straight-line basis over the average customer life. The associated connection and activation costs, to the extent of the upfront fees, are also deferred and amortized on a straight-line basis over the average customer life.

Pricing of local voice services is generally subject to oversight by both state and federal regulatory commissions. Such regulation also covers services, competition, and other public policy issues. Various regulatory rulings and interpretations could result in increases or decreases to revenue in future periods.

IT Services and Hardware — Services are generally recognized as the service is provided. Maintenance on telephony equipment is deferred and recognized ratably over the term of the underlying customer contract, generally one to three years.

Equipment revenue is recognized upon the completion of our contractual obligations, such as shipment, delivery, or customer acceptance. Installation service revenue is generally recognized when installation is complete. We sell equipment and installation services on both a combined and standalone basis.

The Company is a reseller of IT and telephony equipment. For these transactions, we consider the gross versus net revenue recording criteria of ASC 605. Based on this criteria, these equipment revenues and associated costs have generally been recorded on a gross basis rather than recording the revenues net of the associated costs. Vendor rebates are earned on certain equipment sales. When the rebate is earned and the amount is determinable, we recognize the rebate as an offset to cost of products sold.

Discontinued Operations — Postpaid wireless and reciprocal compensation were billed monthly in arrears. Service revenue was billed in regular monthly cycles, which were spread throughout the days of the month. As the last day of each billing cycle rarely coincided with the end of the reporting period for usage-based services such as postpaid wireless, we estimated service revenues earned but not yet billed. Our estimates were based upon historical usage, and we adjusted these estimates during the period in which actual usage was determinable, typically in the following reporting period.

Revenue from prepaid wireless service, which was collected in advance, was not recognized upon billing or cash receipt but rather deferred until the service was provided.

Wireless handset revenue and the related activation revenue were recognized when the products were delivered to and accepted by the customer, as this was considered to be a separate earnings process from the sale of wireless services. Wireless equipment costs were also recognized upon handset sale and were generally in excess of the related handset and activation revenue. Revenue from termination fees was recognized when collection was deemed reasonably assured.

Advertising Expenses

Advertising Expenses — Costs related to advertising are expensed as incurred. Advertising costs were $8.3 million, $7.2 million, and $7.3 million in 2015, 2014, and 2013, respectively.

Legal Expenses

Legal Expenses — In the normal course of business, the Company is involved in various claims and legal proceedings. Legal costs incurred in connection with loss contingencies are expensed as incurred. Legal claim accruals are recorded once determined to be both probable and estimable.

Income Taxes

Income taxes — The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction as well as various foreign, state and local jurisdictions. The provision for income taxes is based upon income in the consolidated financial statements, rather than amounts reported on the income tax return. The income tax provision consists of an amount for taxes currently payable and an amount for tax consequences deferred to future periods. Deferred investment tax credits are amortized as a reduction of the provision for income taxes over the estimated useful lives of the related property, plant and equipment. Deferred income taxes are provided for temporary differences between financial statement and income tax assets and liabilities. Deferred income taxes are recalculated annually at rates then in effect. Valuation allowances are recorded to reduce deferred tax assets to amounts that are more likely than not to be realized. The ultimate realization of the deferred income tax assets depends upon the ability to generate future taxable income during the periods in which basis differences and other deductions become deductible and prior to the expiration of the net operating loss carryforwards.

Previous tax filings are subject to normal reviews by regulatory agencies until the related statute of limitations expires.

Operating Taxes

Operating taxes — Certain operating taxes such as property, sales, use, and gross receipts taxes are reported as expenses in operating income primarily within cost of services. These taxes are not included in income tax expense because the amounts to be paid are not dependent on our level of income. Liabilities for audit exposures are established based on management's assessment of the probability of payment. The provision for such liabilities is recognized as either property, plant and equipment, operating tax expense, or depreciation expense depending on the nature of the audit exposure. Upon resolution of an audit, any remaining liability not paid is released against the account in which it was originally recorded.

Regulatory Taxes

Regulatory taxes — The Company incurs federal and state regulatory taxes on certain revenue producing transactions. We are permitted to recover certain of these taxes by billing the customer; however, collections cannot exceed the amount due to the federal regulatory agency. These federal regulatory taxes are presented in sales and cost of services on a gross basis because, while the Company is required to pay the tax, it is not required to collect the tax from customers and, in fact, does not collect the tax from customers in certain instances. The amounts recorded as revenue for 2015, 2014, and 2013 were $15.5 million, $15.2 million, and $14.9 million, respectively. The amounts expensed for 2015, 2014, and 2013 were $17.9 million, $16.4 million, and $14.9 million, respectively. We record all other federal taxes collected from customers on a net basis.

Stock-Based Compensation

Stock-Based Compensation — Compensation cost is recognized for all share-based awards to employees and non-employee directors. We value all share-based awards to employees at fair value on the date of grant and expense this amount over the required service period, generally defined as the applicable vesting period. For awards which contain a performance condition, compensation expense is recognized over the service period, when achievement of the performance condition is deemed probable. The fair value of stock options and stock appreciation rights is determined using the Black-Scholes option-pricing model using assumptions such as volatility, risk-free interest rate, holding period and dividends. The fair value of stock awards is based on the Company’s closing share price on the date of grant. For all share-based payments, an assumption is also made for the estimated forfeiture rate based on the historical behavior of employees. The forfeiture rate reduces the total fair value of the awards to be recognized as compensation expense. Our accounting policy for graded vesting awards is to recognize compensation expense on a straight-line basis over the vesting period. We have also granted employee awards to be ultimately paid in cash which are indexed to the change in the Company’s common stock price. These awards are adjusted to the fair value of the Company's common stock, and the adjusted fair value is expensed on a pro-rata basis over the vesting period. When an award is granted to an employee who is retirement eligible, the compensation cost is recognized over the service period up to the date that the employee first becomes eligible to retire.

Pension and Postretirement Benefit Plans

Pension and Postretirement Benefit Plans — The Company maintains qualified and non-qualified defined benefit pension plans, and also provides postretirement healthcare and life insurance benefits for eligible employees. We recognize the overfunded or underfunded status of the defined benefit pension and other postretirement benefit plans as either an asset or liability. Changes in the funded status of these plans are recognized as a component of comprehensive income (loss) in the year they occur. Pension and postretirement healthcare and life insurance benefits earned during the year and interest on the projected benefit obligations are accrued and recognized currently in net periodic benefit cost. Prior service costs and credits are amortized over the average life expectancy of participants or remaining service period, based upon whether plan participants are mostly retirees or active employees. Net gains or losses resulting from differences between actuarial experience and assumptions or from changes in actuarial assumptions are recognized as a component of annual net periodic benefit cost. Unrecognized actuarial gains or losses that exceed 10% of the projected benefit obligation are amortized on a straight-line basis over the average remaining service life of active employees for the pension and bargained postretirement plans (approximately 9-13 years) and average life expectancy of retirees for the management postretirement plan (approximately 17 years).

Business Combinations

Business Combinations — In accounting for business combinations, we apply the accounting requirements of ASC 805, “Business Combinations,” which requires the recording of net assets of acquired businesses at fair value. In developing estimates of fair value of acquired assets and assumed liabilities, management analyzes a variety of factors including market data, estimated future cash flows of the acquired operations, industry growth rates, current replacement cost for fixed assets, and market rate assumptions for contractual obligations. Such a valuation requires management to make significant estimates and assumptions, particularly with respect to the intangible assets. In addition, contingent consideration is presented at fair value at the date of acquisition. Transaction costs are expensed as incurred.

Fair Value Measurements

Fair Value Measurements — Fair value of financial and non-financial assets and liabilities is defined as the price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value is utilized to measure certain investments on a recurring basis. Fair value measurements are also utilized to determine the initial value of assets and liabilities acquired in a business combination, to perform impairment tests, and for disclosure purposes.

Management uses quoted market prices and observable inputs to the maximum extent possible when measuring fair value. In the absence of quoted market prices or observable inputs, fair value is determined using valuation models that incorporate assumptions that a market participant would use in pricing the asset or liability.

Fair value measurements are classified within one of three levels, which prioritize the inputs used in the methodologies of measuring fair value for assets and liabilities, as follows:

Level 1 — Quoted market prices for identical instruments in an active market;

Level 2 — Quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs); and

Level 3 — Unobservable inputs that reflect management's determination of assumptions that market participants would use in pricing the asset or liability. These inputs are developed based on the best information available, including our own data.

Foreign Currency Translation and Transactions

Foreign Currency Translation and Transactions — The financial position of foreign subsidiaries is translated at the exchange rates in effect at the end of the period, while revenues and expenses are translated at average rates of exchange during the period. Gains or losses from translation of foreign operations where the local currency is the functional currency are included as components of accumulated other comprehensive income (loss). Gains and losses arising from foreign currency transactions are recorded in other income (expense) in the period incurred.

Earnings Per Common Share

Basic earnings per common share ("EPS") is based upon the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that would occur upon issuance of common shares for awards under stock-based compensation plans, exercise of warrants, or conversion of preferred stock, but only to the extent that they are considered dilutive.

Fair Value of Financial Instruments

The fair value of our investment in CyrusOne was based on the closing market price of CyrusOne's common stock on December 31, 2015 and 2014. This fair value measurement is considered Level 1 of the fair value hierarchy.

The fair value of debt instruments was based on closing or estimated market prices of the Company’s debt at December 31, 2015 and 2014, which is considered Level 2 of the fair value hierarchy.