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Income Taxes (Summary of Valuation Allowance) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation Allowance [Roll Forward]
Balance at beginning of period	$ (158.8)	$ (136.8)	$ (120.7)
Decrease in Valuation Allowance	20.6	(22.0)	(16.1)
Balance at end of period	$ (138.2)	$ (158.8)	$ (136.8)

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.