Divestitures and Discontinued Operations (Net Revenues and After-Tax Earnings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Net revenues	$ 0	$ 15.9
Discontinued operations, net of tax	(2.2)	(9.1)
Integration business divestiture [Member]
Net revenues	0	15.9
After-tax earnings (loss) from operations	(0.2)	(0.8)
Gain (loss) on sale, net of tax	0	0	(5.0)
Discontinued operations, net of tax	$ (0.2)	$ (0.8)