Other, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Component of Other Income, Nonoperating [Line Items]
Interest income	$ 4.7	$ 5.1
Exchange gain (loss)	(1.8)	0.1
Earnings (loss) from equity investments	(5.2)
Other	2.1	(0.3)
Other, net	(0.2)	4.9
HussmannBusinessEquityOwnership [Member]
Component of Other Income, Nonoperating [Line Items]
Earnings (loss) from equity investments	$ 5.2	$ 0