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Accumulated Other Comprehensive (Loss) Income - Reclassifications Out of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Cost of products sold                 $ 3,925.9 $ 3,712.2 $ 3,525.7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 730.8 575.3 537.0
Recognition of actuarial losses                 (3.2) (34.1) (3.8)
Tax (expense) benefit                 (168.8) (144.0) (147.0)
Income after tax $ 166.5 $ 168.2 $ 118.2 $ 109.1 $ 104.0 $ 105.7 $ 137.1 $ 84.5 562.0 431.3 $ 390.0
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income after tax                 (5.2) (22.0)  
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                 (2.4) 4.4  
Tax (expense) benefit                   (0.6)  
Income after tax                 (2.4) 3.8  
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                 (3.0) 4.1  
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                 0.6 0.4  
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)  
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Defined Benefit Plan Adjustments [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Recognition of actuarial losses [1]                 (3.2) (34.1)  
Tax (expense) benefit                 0.4 8.3  
Income after tax                 $ (2.8) $ (25.8)  
[1] These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost. Refer to Note 14, “Defined Benefit Plans,” for additional information.