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Commitments and Contingencies - Changes in Carrying Amount of Service and Product Warranties (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 38.1
Service and product warranty provision 43.2
Payments (43.1)
Foreign currency translation (0.2)
Ending balance $ 38.0