Recently Issued Accounting Standards	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Issued Accounting Standards In May 2014, the FASB issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. This standard also includes expanded disclosure requirements that result in an entity providing users of financial statements with comprehensive information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from the entity’s contracts with customers. The Company adopted the new standard and all subsequent amendments as of January 1, 2018. The Company utilized the full retrospective method; therefore, each prior reporting period presented was adjusted beginning with the issuance of the Company’s 2018 interim financial statements. The most significant impact of adopting the new standard is the change to the treatment of hardware revenue in the Infrastructure Solutions category from recording hardware revenue as a principal (gross) to recording revenue as an agent (net). Based on our assessment of ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net), issued by the FASB in March 2016, the Company acts as an agent and as such will record hardware sales net of the related cost of products. ASU 2016-08 clarifies the implementation guidance on principal versus agent considerations focusing on a control model rather than a risk and reward model. As a result of adopting ASU 2014-09, revenue and cost of products decreased by $168.2 million and $222.8 million, for 2016 and 2017, respectively. Changes in accounting policies related to variable consideration or rebates did not have a material effect on the Company's financial statements. Fulfillment and acquisition costs that are now recorded as an asset and amortized on a monthly basis decreased expense by $1.5 million and $0.7 million, for 2016 and 2017, respectively. Additionally, as a result of the adoption of ASC 606 an increase to tax expense of $0.5 million was recorded in 2016 and a decrease to tax expense of $4.2 million was recorded in 2017. This change to expense for fulfillment and acquisition costs and tax expense increased both basic and diluted earnings per share for 2016 by $0.02 and increased both basic and diluted earnings per share for 2017 by $0.11 and $0.12, respectively. An incremental asset related to fulfillment and acquisition costs of $30.1 million was recorded on the balance sheet as of January 1, 2016, with an offsetting reduction in "Accumulated deficit." As a result of the entry, the total contract asset related to fulfillment and acquisition costs was $30.6 million at January 1, 2016. The impact of these adjustments resulted in a decrease of $10.8 million to "Deferred income tax assets" as of January 1, 2016, with the offset to "Accumulated deficit." See Note 3 for additional disclosures as a result of adopting ASC Topic 606. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which amends the guidance in GAAP on the classification and measurement of financial instruments. The amended guidance requires entities to carry all investments in equity securities at fair value and changes in fair value shall be recognized through net income unless the entity has elected the practicability exception to fair value measurement. This standard is effective for the fiscal year ending December 31, 2018 and requires a cumulative-effect adjustment to beginning retained earnings on this date. The Company adopted the standard effective January 1, 2018. The Company does not hold any equity securities as of December 31, 2018. In February 2016, the FASB issued ASU 2016-02, Leases, which represents a wholesale change to lease accounting. The standard introduces a lessee model that brings most leases on the balance sheet, as well as aligns certain underlying principles of the new lessor model with those in ASC 606. The ASU is effective for public entities for fiscal years beginning after December 15, 2018. As issued, the standard requires lessors and lessees to use a modified retrospective transition method for existing leases. ASU 2016-02 was amended in January 2018 by the provisions of ASU 2018-01, “Land Easement Practical Expedient for Transition to Topic 842,” and in July 2018 by the provisions of ASU 2018-10, “Codification Improvements to Topic 842, Leases,” and ASU 2018-11, “Targeted Improvements,” and in November 2018 by the provisions of ASU 2018-20, "Narrow-Scope Improvements for Lessors." The Company adopted the standard and all subsequent amendments on January 1, 2019. The Company has completed procedures to identify the existing lease population to which the new standard is applicable. The Company has implemented changes to accounting policies, processes, systems, and internal controls. The Company procured a third-party lease accounting software solution to facilitate the ongoing accounting and financial reporting requirements of the ASU. The new standard will result in the recognition of operating lease right-of-use assets of approximately $35 million to $45 million on the Company’s consolidated balance sheets. The new standard allows for certain practical expedients relating to the separation of lease and non-lease components, which is required under Topic 842. The Company's operating leases for certain network services that include Customer Premise Equipment, such as handsets and set-top boxes, have lease and non-lease components which the Company has elected to account for as one single non-lease component in accordance with ASC 606. The Company also elected the practical expedient allowing entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The cumulative effect of adopting the standard is immaterial. The adoption of this standard, as amended, will not result in the restatement of comparative periods presented. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow - Classification of Certain Cash Receipts and Cash Payments, which amends ASC 230 to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The FASB issued the ASU with the intent of reducing diversity in practice. The ASU is effective for public entities for annual reporting periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material effect on the Company’s Consolidated Statement of Cash Flows. In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which amends the requirements in ASC 715 related to the income statement presentation of the components of net periodic benefit cost for an entity’s sponsored defined benefit pension and other postretirement plans. The ASU requires entities to disaggregate the current service cost component from the other components of net benefit cost (the “other components”) and present it with other current compensation costs for related employees in the income statement. The other components shall be presented elsewhere in the income statement and outside of income from operations, if such a subtotal is presented, on a retrospective basis as of the date of adoption. In addition, only the service cost component of net benefit cost is eligible for capitalization on a prospective basis. The ASU is effective for public business entities for annual periods beginning after December 15, 2017. The Company retrospectively adopted the standard effective January 1, 2018. The Company re-classed $1.3 million and $6.6 million of other components of net benefit cost from "Cost of services and products" to a new line below Operating income, "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2016 and 2017, respectively. The Company re-classed $3.0 million and $6.0 million of other components of net benefit cost from "Selling, general and administrative," to "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2016 and 2017, respectively. The Company re-classed $4.0 million of other components of net benefit cost from "Other" related to a settlement charge to "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2017. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation, which amends the scope of modification accounting for share-based payment arrangements. The ASU is effective for public business entities for annual periods beginning after December 15, 2017. The Company prospectively adopted the standard effective January 1, 2018 and will apply the amended guidance to any awards modified on or after this date. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which improves the hedge accounting model to facilitate financial reporting that more closely reflects a company’s risk management activities. The FASB’s new guidance will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with companies’ risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. This update is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance of the update. The Company early-adopted the guidance effective April 1, 2018. In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows entities to elect to make a one-time reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The ASU is effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within those fiscal years. Early adoption is permitted. The Company early adopted this guidance effective December 31, 2017, resulting in a reclassification adjustment of $32.2 million to "Accumulated deficit" from "Accumulated other comprehensive loss" on the Consolidated Balance Sheets. The amount of the reclassification is calculated on the basis of the difference between the historical and newly enacted tax rates on deferred taxes related to our pension and postretirement benefit plans. In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the requirements in ASU 350-40 for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments in this ASU also require the entity to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element of the arrangement and classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The amendments should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption is permitted in any interim period after issuance of the update. The Company early adopted this standard prospectively effective January 1, 2019. Other accounting standards that have been issued or proposed by the FASB or other standards-setting bodies that do not require adoption until a future date are not expected to have a material impact on the Company’s consolidated financial statements upon adoption.

Recently Issued Accounting Standards

In May 2014, the FASB issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. This standard also includes expanded disclosure requirements that result in an entity providing users of financial statements with comprehensive information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from the entity’s contracts with customers. The Company adopted the new standard and all subsequent amendments as of January 1, 2018. The Company utilized the full retrospective method; therefore, each prior reporting period presented was adjusted beginning with the issuance of the Company’s 2018 interim financial statements.

The most significant impact of adopting the new standard is the change to the treatment of hardware revenue in the Infrastructure Solutions category from recording hardware revenue as a principal (gross) to recording revenue as an agent (net). Based on our assessment of ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net), issued by the FASB in March 2016, the Company acts as an agent and as such will record hardware sales net of the related cost of products. ASU 2016-08 clarifies the implementation guidance on principal versus agent considerations focusing on a control model rather than a risk and reward model. As a result of adopting ASU 2014-09, revenue and cost of products decreased by $168.2 million and $222.8 million, for 2016 and 2017, respectively. Changes in accounting policies related to variable consideration or rebates did not have a material effect on the Company's financial statements. Fulfillment and acquisition costs that are now recorded as an asset and amortized on a monthly basis decreased expense by $1.5 million and $0.7 million, for 2016 and 2017, respectively. Additionally, as a result of the adoption of ASC 606 an increase to tax expense of $0.5 million was recorded in 2016 and a decrease to tax expense of $4.2 million was recorded in 2017. This change to expense for fulfillment and acquisition costs and tax expense increased both basic and diluted earnings per share for 2016 by $0.02 and increased both basic and diluted earnings per share for 2017 by $0.11 and $0.12, respectively. An incremental asset related to fulfillment and acquisition costs of $30.1 million was recorded on the balance sheet as of January 1, 2016, with an offsetting reduction in "Accumulated deficit." As a result of the entry, the total contract asset related to fulfillment and acquisition costs was $30.6 million at January 1, 2016. The impact of these adjustments resulted in a decrease of $10.8 million to "Deferred income tax assets" as of January 1, 2016, with the offset to "Accumulated deficit." See Note 3 for additional disclosures as a result of adopting ASC Topic 606.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which amends the guidance in GAAP on the classification and measurement of financial instruments. The amended guidance requires entities to carry all investments in equity securities at fair value and changes in fair value shall be recognized through net income unless the entity has elected the practicability exception to fair value measurement. This standard is effective for the fiscal year ending December 31, 2018 and requires a cumulative-effect adjustment to beginning retained earnings on this date. The Company adopted the standard effective January 1, 2018. The Company does not hold any equity securities as of December 31, 2018.

In February 2016, the FASB issued ASU 2016-02, Leases, which represents a wholesale change to lease accounting. The standard introduces a lessee model that brings most leases on the balance sheet, as well as aligns certain underlying principles of the new lessor model with those in ASC 606. The ASU is effective for public entities for fiscal years beginning after December 15, 2018. As issued, the standard requires lessors and lessees to use a modified retrospective transition method for existing leases. ASU 2016-02 was amended in January 2018 by the provisions of ASU 2018-01, “Land Easement Practical Expedient for Transition to Topic 842,” and in July 2018 by the provisions of ASU 2018-10, “Codification Improvements to Topic 842, Leases,” and ASU 2018-11, “Targeted Improvements,” and in November 2018 by the provisions of ASU 2018-20, "Narrow-Scope Improvements for Lessors." The Company adopted the standard and all subsequent amendments on January 1, 2019.

The Company has completed procedures to identify the existing lease population to which the new standard is applicable. The Company has implemented changes to accounting policies, processes, systems, and internal controls. The Company procured a third-party lease accounting software solution to facilitate the ongoing accounting and financial reporting requirements of the ASU. The new standard will result in the recognition of operating lease right-of-use assets of approximately $35 million to $45 million on the Company’s consolidated balance sheets.

The new standard allows for certain practical expedients relating to the separation of lease and non-lease components, which is required under Topic 842. The Company's operating leases for certain network services that include Customer Premise Equipment, such as handsets and set-top boxes, have lease and non-lease components which the Company has elected to account for as one single non-lease component in accordance with ASC 606. The Company also elected the practical expedient allowing entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The cumulative effect of adopting the standard is immaterial. The adoption of this standard, as amended, will not result in the restatement of comparative periods presented.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow - Classification of Certain Cash Receipts and Cash Payments, which amends ASC 230 to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The FASB issued the ASU with the intent of reducing diversity in practice. The ASU is effective for public entities for annual reporting periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this standard effective January 1, 2018. The adoption of this standard did not have a material effect on the Company’s Consolidated Statement of Cash Flows.

In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which amends the requirements in ASC 715 related to the income statement presentation of the components of net periodic benefit cost for an entity’s sponsored defined benefit pension and other postretirement plans. The ASU requires entities to disaggregate the current service cost component from the other components of net benefit cost (the “other components”) and present it with other current compensation costs for related employees in the income statement. The other components shall be presented elsewhere in the income statement and outside of income from operations, if such a subtotal is presented, on a retrospective basis as of the date of adoption. In addition, only the service cost component of net benefit cost is eligible for capitalization on a prospective basis. The ASU is effective for public business entities for annual periods beginning after December 15, 2017. The Company retrospectively adopted the standard effective January 1, 2018. The Company re-classed $1.3 million and $6.6 million of other components of net benefit cost from "Cost of services and products" to a new line below Operating income, "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2016 and 2017, respectively. The Company re-classed $3.0 million and $6.0 million of other components of net benefit cost from "Selling, general and administrative," to "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2016 and 2017, respectively. The Company re-classed $4.0 million of other components of net benefit cost from "Other" related to a settlement charge to "Other components of pension and postretirement benefit plans expense," on the Consolidated Statements of Operations for 2017.

In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation, which amends the scope of modification accounting for share-based payment arrangements. The ASU is effective for public business entities for annual periods beginning after December 15, 2017. The Company prospectively adopted the standard effective January 1, 2018 and will apply the amended guidance to any awards modified on or after this date.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which improves the hedge accounting model to facilitate financial reporting that more closely reflects a company’s risk management activities. The FASB’s new guidance will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with companies’ risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. This update is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted in any interim period after issuance of the update. The Company early-adopted the guidance effective April 1, 2018.

In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows entities to elect to make a one-time reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The ASU is effective for public entities for annual reporting periods beginning after December 15, 2018, and for interim periods within those fiscal years. Early adoption is permitted. The Company early adopted this guidance effective December 31, 2017, resulting in a reclassification adjustment of $32.2 million to "Accumulated deficit" from "Accumulated other comprehensive loss" on the Consolidated Balance Sheets. The amount of the reclassification is calculated on the basis of the difference between the historical and newly enacted tax rates on deferred taxes related to our pension and postretirement benefit plans.

In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software, which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the requirements in ASU 350-40 for capitalizing implementation costs incurred to develop or obtain internal-use software. The amendments in this ASU also require the entity to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element of the arrangement and classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element. The amendments in this ASU are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The amendments should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption is permitted in any interim period after issuance of the update. The Company early adopted this standard prospectively effective January 1, 2019.

Other accounting standards that have been issued or proposed by the FASB or other standards-setting bodies that do not require adoption until a future date are not expected to have a material impact on the Company’s consolidated financial statements upon adoption.