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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,924.4 $ 2,357.9 $ 2,775.5 $ 2,427.8
Amounts classified into accumulated other comprehensive (loss) income 13.5 11.4 17.3 (38.8)
Amounts reclassified from accumulated other comprehensive (loss) income (0.9) 1.5 (0.6) 1.1
Other comprehensive (loss) income, net of tax 12.6 12.9 16.7 (37.7)
Ending Balance 3,043.5 2,463.1 3,043.5 2,463.1
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 13.0 (53.2) 7.2 (11.5)
Amounts classified into accumulated other comprehensive (loss) income 12.0 11.4 17.8 (30.3)
Other comprehensive (loss) income, net of tax 12.0 11.4 17.8 (30.3)
Ending Balance 25.0 (41.8) 25.0 (41.8)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2.7 (2.6) 4.2 5.5
Amounts classified into accumulated other comprehensive (loss) income 1.5   (0.3) (7.7)
Amounts reclassified from accumulated other comprehensive (loss) income (0.9) 1.5 (0.6) 1.1
Other comprehensive (loss) income, net of tax 0.6 1.5 (0.9) (6.6)
Ending Balance 3.3 (1.1) 3.3 (1.1)
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     (0.2) (0.8)
Other comprehensive (loss) income, net of tax     (0.2) (0.8)
Ending Balance (66.7) (67.4) (66.7) (67.4)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (51.0) (123.2) (55.1) (72.6)
Ending Balance $ (38.4) $ (110.3) $ (38.4) $ (110.3)