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Standard Product Warranties (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Change in aggregate product warranty liabilities    
Beginning reserve $ 15.2 $ 14.3
Current year provision 11.9 8.9
Current year claims (9.8) (9.2)
Ending reserve $ 17.3 $ 14.0