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Income Taxes - Income Tax Benefit (Expense) from Continuing Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current Income Tax Expense									$ (41.7)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (49.4)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (43.3)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Benefit (Expense)									(5.5)us-gaap_DeferredIncomeTaxExpenseBenefit	(50.1)us-gaap_DeferredIncomeTaxExpenseBenefit	12.9us-gaap_DeferredIncomeTaxExpenseBenefit
Increase Unrecognized Tax Benefits									(0.4)	(0.4)	(0.2)
Income Tax Expense	$ (29.8)us-gaap_IncomeTaxExpenseBenefit	$ 0.8us-gaap_IncomeTaxExpenseBenefit	$ (1.9)us-gaap_IncomeTaxExpenseBenefit	$ (16.7)us-gaap_IncomeTaxExpenseBenefit	$ (26.6)us-gaap_IncomeTaxExpenseBenefit	$ (33.4)us-gaap_IncomeTaxExpenseBenefit	$ (13.9)us-gaap_IncomeTaxExpenseBenefit	$ (26.0)us-gaap_IncomeTaxExpenseBenefit	$ (47.6)us-gaap_IncomeTaxExpenseBenefit	$ (99.9)us-gaap_IncomeTaxExpenseBenefit	$ (30.6)us-gaap_IncomeTaxExpenseBenefit

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

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