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Accrued Expenses - Product Warranties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in aggregate product warranty liabilities    
Beginning reserve $ 30.4 $ 29.1
Current year provision 18.1 16.6
Current year claims (16.3) (16.3)
Current year foreign exchange (0.3) 1.0
Ending reserve $ 31.9 $ 30.4