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Accumulated Other Comprehensive (Loss) Income - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 3,043.5 $ 2,463.1 $ 2,775.5 $ 2,427.8
Amounts classified into accumulated other comprehensive (loss) income (15.6) 17.4 1.7 (21.4)
Amounts reclassified from accumulated other comprehensive (loss) income 0.2 1.4 (0.4) 2.5
Other comprehensive (loss) income, net of tax (15.4) 18.8 1.3 (18.9)
Ending Balance 3,054.6 2,628.6 3,054.6 2,628.6
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 25.0 (41.8) 7.2 (11.5)
Amounts classified into accumulated other comprehensive (loss) income (14.9) 17.6 2.9 (12.7)
Other comprehensive (loss) income, net of tax (14.9) 17.6 2.9 (12.7)
Ending Balance 10.1 (24.2) 10.1 (24.2)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 3.3 (1.1) 4.2 5.5
Amounts classified into accumulated other comprehensive (loss) income 1.7   1.4 (7.7)
Amounts reclassified from accumulated other comprehensive (loss) income (1.2) 1.0 (1.8) 2.1
Other comprehensive (loss) income, net of tax 0.5 1.0 (0.4) (5.6)
Ending Balance 3.8 (0.1) 3.8 (0.1)
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (66.7) (67.4) (66.5) (66.6)
Amounts classified into accumulated other comprehensive (loss) income (2.4) (0.2) (2.6) (1.0)
Amounts reclassified from accumulated other comprehensive (loss) income 1.4 0.4 1.4 0.4
Other comprehensive (loss) income, net of tax (1.0) 0.2 (1.2) (0.6)
Ending Balance (67.7) (67.2) (67.7) (67.2)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (38.4) (110.3) (55.1) (72.6)
Ending Balance $ (53.8) $ (91.5) $ (53.8) $ (91.5)