Income Tax Expense - Components of Income Before Tax and Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of income (loss) before income taxes
United States	$ (595.1)	$ (170.3)	$ (98.2)
Foreign	100.2	27.0	75.0
Net loss from continuing operations before income taxes	(494.9)	(143.3)	(23.2)
Current
U.S. Federal	(14.4)us-gaap_CurrentFederalTaxExpenseBenefit	0us-gaap_CurrentFederalTaxExpenseBenefit	(0.1)us-gaap_CurrentFederalTaxExpenseBenefit
U.S. State	0.3	(0.6)	(0.1)
Foreign	17.8us-gaap_CurrentForeignTaxExpenseBenefit	13.6us-gaap_CurrentForeignTaxExpenseBenefit	16.0us-gaap_CurrentForeignTaxExpenseBenefit
Total	3.7us-gaap_CurrentIncomeTaxExpenseBenefit	13.0us-gaap_CurrentIncomeTaxExpenseBenefit	15.8us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
U.S. Federal	(234.6)	(119.1)	3.2
U.S. State	(21.2)	(9.4)	0.7
Foreign	(8.5)	(2.2)	1.0
Total	(264.3)us-gaap_DeferredIncomeTaxExpenseBenefit	(130.7)us-gaap_DeferredIncomeTaxExpenseBenefit	4.9us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax (benefit) expense	$ (260.6)us-gaap_IncomeTaxExpenseBenefit	$ (117.7)us-gaap_IncomeTaxExpenseBenefit	$ 20.7us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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