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Accumulated Other Comprehensive (Loss) Income - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of products sold $ 1,126.9 $ 909.5
Tax (expense) benefit (45.9) (29.9)
Income after tax 177.8 109.1
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gain (Loss) [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (0.5) 0.6
Tax (expense) benefit 0.2 (0.2)
Income after tax (0.3) 0.4
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gain (Loss) [Member] | Foreign exchange contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of products sold (0.8) 0.6
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gain (Loss) [Member] | Commodity Contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of products sold 0.1 (0.2)
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivative Hedging Gain (Loss) [Member] | Interest rate contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense $ 0.2 $ 0.2