Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Other Current Liabilities
Deferred revenue	$ 83.0	$ 70.3
Accrued compensation	77.5	68.8
Income taxes payable	55.8	61.5
Accrued warranty	27.8	28.4
Derivative liabilities	6.2	6.8
Other accrued expenses	69.7	65.9
Other current liabilities	320.0	301.7
Changes in accrued warranty
Balance at the beginning of the year	28.4	22.9
Accruals for warranties issued during the year	29.1	28.6
Settlements of warranty claims	(28.6)	(22.0)
Foreign currency impact	(1.0)	(1.1)
Balance at the end of the year	$ 27.8	$ 28.4