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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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Current Income Tax Expense									$ (49.4)	$ (43.3)	$ (43.4)
Deferred Income Tax Benefit (Expense)									(50.1)	12.9	35.2
Unrecognized Tax Benefit									(0.4)	(0.2)	1.6
Income Tax Expense	$ (26.6)	$ (33.4)	$ (13.9)	$ (26.0)	$ 4.3	$ (25.9)	$ 5.1	$ (14.1)	$ (99.9)	$ (30.6)	$ (6.6)

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.