Product Warranty (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Y	Sep. 30, 2011	Dec. 31, 2011
Warranty reserve activity:
Balance at beginning of period	$ 255.2	$ 237.5	$ 240.5	$ 199.5
Acquisitions	0	0	0.1	2.6
Accruals for warranties issued during the period	41.7	43.2	133.0	136.8
Settlements made (in cash or in kind) during the period	(43.4)	(40.5)	(117.4)	(109.9)
Foreign currency translation	2.4	(14.9)	(0.3)	(3.7)
Balance at end of period	255.9	225.3	255.9	225.3
Product warranty period, minimum			1
Product warranty period, maximum			4
Product warranty accrual, current	224.1		224.1		212.7
Product warranty accrual, noncurrent	$ 31.8		$ 31.8		$ 27.8