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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]        
Other income (expense), net $ 1.9 $ 1.2 $ (4.1) $ 6.0
Income tax expense (22.7) (16.6) (82.6) (53.2)
Interest expense, net (57.7) (23.7) (160.8) (75.9)
Net income 90.6 86.1 189.5 256.9
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 0.7 0.7 2.2 2.2
Income tax expense (0.2) (0.2) (0.6) (0.6)
Net income 0.5 0.5 1.6 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 $ 1.1 1.1 $ 3.3 3.3
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]        
Income tax expense   (1.2)   (1.5)
Interest expense, net   4.9   5.8
Net income   $ 3.7   $ 4.3