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Contingencies - Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]    
Balance beginning of period $ 134.7 $ 159.9
Additions 19.6 94.6
Collections, settlements converted to notes receivable and other adjustments (82.6) (119.8)
Balance end of period $ 71.7 $ 134.7