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Commitments and Contingencies Product Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 42.9 $ 36.6
Accruals 20.6 16.0
Settlements (5.6) (7.3)
Adjustments to prior period accruals (9.2) (2.3)
Foreign currency translation 0.8 (0.1)
Ending balance $ 49.5 $ 42.9