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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                
Other income (expense), net $ 14.3     $ 1.9     $ 5.8 $ (4.1)
Income tax expense (46.9)     (22.7)     (113.4) (82.6)
Net income 128.5 $ 85.8 $ 111.2 90.6 $ 102.7 $ (4.0) 325.5 189.5
Reclassification out of Accumulated Other Comprehensive Income | Pension and post retirement benefit plans                
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                
Other income (expense), net 1.0     0.7     3.0 2.2
Income tax expense (0.3)     (0.2)     (0.8) (0.6)
Net income 0.7     0.5     2.2 1.6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost                
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                
Other income (expense), net (0.4)     (0.4)     (1.1) (1.1)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss                
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                
Other income (expense), net $ 1.4     $ 1.1     $ 4.1 $ 3.3