Product Warranty (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Warranty reserve activity:
Balance at beginning of period	$ 284.6	$ 294.9
Accruals for warranties issued during the period	34.0	55.6
Settlements made (in cash or in kind) during the period	(44.9)	(46.1)
Foreign currency translation	(20.8)	0.6
Balance at end of period	252.9	305.0
Product warranty period, minimum, years	1 year
Product warranty period, maximum, years	4 years
Product warranty accrual, current	217.0		245.7
Product warranty accrual, noncurrent	$ 35.9		$ 38.9