Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Current Liabilities
Deferred revenue	$ 82.5	$ 83.0
Accrued compensation	85.1	77.5
Income taxes payable	60.9	55.8
Accrued warranty	27.9	27.9
Derivative liabilities	0.5	6.2
Other accrued expenses	79.8	69.6
Other current liabilities	336.7	320.0
Changes in accrued warranty
Balance at the beginning of the year	27.9	28.4
Accruals for warranties issued during the year	15.7	13.5
Settlements of warranty claims	(15.9)	(13.0)
Foreign currency impact	0.2	(1.0)
Balance at the end of the year	$ 27.9	$ 27.9