Product Warranty (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Product warranty rollforward
Beginning balance	$ 72.7	$ 66.8
Acquisition	0	4.5
Provisions	10.0	15.6
Payments	(7.9)	(15.0)
Translation adjustment	1.9	2.7
Ending balance	76.7	74.6
Product warranty liability
Accounts payable and accrued expenses	42.7		38.6
Other non-current liabilities	34.0		34.1
Total product warranty liability	$ 76.7	$ 74.6
Minimum warranty term (in years)	1
Maximum warranty term (in years)	3