Commitments and Contingencies (Product Warranty Liability) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Balance at beginning of period	$ 636.4	$ 631.4
Reductions for payments	(56.0)	(46.1)
Accruals for warranties issued during the current period	59.7	41.4
Changes to accruals related to preexisting warranties	(1.0)	(0.7)
Translation	1.3	3.0
Balance at end of period	$ 640.4	$ 629.0