Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income (loss)	$ 49.2us-gaap_NetIncomeLoss	$ 7.0us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	61.2	46.9
Provision for loss on receivables	2.1us-gaap_ProvisionForDoubtfulAccounts	2.4us-gaap_ProvisionForDoubtfulAccounts
Loss (income) from CyrusOne equity method investment	3.1	(0.5)
Noncash portion of interest expense	1.4	1.7
Deferred income tax provision	27.8us-gaap_DeferredIncomeTaxExpenseBenefit	8.8us-gaap_DeferredIncomeTaxExpenseBenefit
Pension and other postretirement payments in excess of expense	(3.6)	(6.0)
Stock-based compensation	1.3us-gaap_ShareBasedCompensation	0.8us-gaap_ShareBasedCompensation
Gain on sale of wireless spectrum licenses	(112.6)	0
Amortization of deferred gain	(6.5)	(3.6)
(Gain) loss on sale or disposal of assets, net	1.4us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Excess tax benefit for share based payments	(0.2)	(0.1)
Other, net	2.4us-gaap_OtherNoncashIncomeExpense	(0.4)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Increase in receivables	(1.9)us-gaap_IncreaseDecreaseInReceivables	(22.1)us-gaap_IncreaseDecreaseInReceivables
Decrease (increase) in inventory, materials, supplies, prepaid expenses and other current assets	1.2	(4.0)
(Decrease) increase in accounts payable	(24.2)	19.0
Increase (decrease) in accrued and other current liabilities	2.4	(10.2)
Decrease in other noncurrent assets	0.1	0.4
Increase (decrease) in other noncurrent liabilities	1.7	(2.3)
Net cash provided by operating activities	6.3	37.8
Cash flows from investing activities
Capital expenditures	(57.9)	(34.3)
Dividends received from CyrusOne	6.0	7.1
Proceeds from sale of assets	0	1.9
Other, net	(0.1)	0
Net cash provided by (used in) investing activities	(52.0)	(25.3)
Cash flows from financing activities
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days	7.5	(4.1)
Repayment of debt	(3.3)	(5.2)
Dividends paid on preferred stock	(2.6)	(2.6)
Proceeds from exercise of options and warrants	0	0.6
Excess tax benefit for share based payments	0.2	0.1
Other, net	(0.6)	(1.7)
Net cash (used in) provided by financing activities	1.2	(12.9)
Net increase (decrease) in cash and cash equivalents	(44.5)	(0.4)
Cash and cash equivalents at beginning of period	57.9
Cash and cash equivalents at end of period	13.4
Noncash investing and financing transactions:
Accrual of CyrusOne dividends	9.0us-gaap_DividendsReceivable
Acquisition of property by assuming debt and other noncurrent liabilities	1.3	0
Acquisition of property on account	$ 28.9	$ 21.0

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

+ Details

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585

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- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph c

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

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Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

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- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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