Income Taxes (Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Tax expense, net against gain on sale of discontinued operations	$ 18.0
Tax effect of discontinued operation	$ (10.3)	$ 6.2	$ 17.9