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Warranties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]      
Beginning balance $ 17.8 $ 14.7 $ 12.5
Warranty costs incurred (7.1) (6.1) (5.9)
Warranty originations and revisions 17.2 12.6 11.9
Warranty expirations (6.4) (3.4) (3.8)
Ending balance $ 21.5 $ 17.8 $ 14.7