Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]
Cash received from business divestitures, net of cash relinquished	$ 6.8	$ 4.9	$ 13.0
Loss from discontinued operations, net of income taxes	(0.9)	(2.8)	(8.7)
Total assets of discontinued operations	$ 45.4	$ 51.7