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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
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 3,064.8 $ 2,775.5
Ending Balance 2,914.8 2,924.4
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 3.3 7.2
Amounts classified into accumulated other comprehensive (loss) income 11.6 5.8
Net current period other comprehensive (loss) income 11.6 5.8
Ending Balance 14.9 13.0
Derivative Hedging Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 2.9 4.2
Amounts classified into accumulated other comprehensive (loss) income 49.2 (1.8)
Amounts reclassified from accumulated other comprehensive (loss) income (1.1) 0.3
Net current period other comprehensive (loss) income 48.1 (1.5)
Ending Balance 51.0 2.7
Defined Benefit Plan Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (30.8) (66.5)
Amounts classified into accumulated other comprehensive (loss) income 0.2 (0.2)
Net current period other comprehensive (loss) income 0.2 (0.2)
Ending Balance (30.6) (66.7)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (24.6) (55.1)
Amounts classified into accumulated other comprehensive (loss) income 61.0 3.8
Amounts reclassified from accumulated other comprehensive (loss) income (1.1) 0.3
Net current period other comprehensive (loss) income 59.9 4.1
Ending Balance $ 35.3 $ (51.0)