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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]            
Other income (expense), net $ 6.3   $ 2.1   $ (8.5) $ (6.1)
Income tax expense (28.5)   (41.5)   (66.5) (60.0)
Net income 85.8 $ 111.2 102.7 $ (4.0) 197.0 98.8
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   2.0 1.5
Income tax expense (0.3)   (0.2)   (0.5) (0.4)
Net income 0.7   0.5   1.5 1.1
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)   (0.7) (0.7)
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   $ 2.7 $ 2.2