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Accumulated Other Comprehensive Income (Loss) - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 2,177.1 $ 2,952.4 $ 2,086.9 $ 3,064.8
Other 0.4   13.3  
Ending Balance 2,219.0 3,030.1 2,219.0 3,030.1
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 0.9 (12.8) (12.1) 3.3
Amounts classified into accumulated other comprehensive (loss) income (16.6) (54.4) (3.6) (70.5)
Other 0.0   0.0  
Amounts reclassified from accumulated other comprehensive (loss) income 0.0 0.0 0.0 0.0
Net current period other comprehensive (loss) income (16.6) (54.4) (3.6) (70.5)
Ending Balance (15.7) (67.2) (15.7) (67.2)
Derivative Hedging Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 92.4 71.5 93.5 2.9
Amounts classified into accumulated other comprehensive (loss) income 0.8 24.9 5.2 97.3
Other 0.0   0.0  
Amounts reclassified from accumulated other comprehensive (loss) income (2.5) 0.7 (8.0) (3.1)
Net current period other comprehensive (loss) income (1.7) 25.6 (2.8) 94.2
Ending Balance 90.7 97.1 90.7 97.1
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (38.0) (30.9) (44.0) (30.8)
Amounts classified into accumulated other comprehensive (loss) income 1.7 (1.5) 1.5 (1.6)
Other (0.3)   5.9  
Amounts reclassified from accumulated other comprehensive (loss) income (1.8) 0.3 (1.8) (0.3)
Net current period other comprehensive (loss) income (0.4) (1.2) 5.6 (1.3)
Ending Balance (38.4) (32.1) (38.4) (32.1)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 55.3 27.8 37.4 (24.6)
Amounts classified into accumulated other comprehensive (loss) income (14.1) (31.0) 3.1 25.2
Other (0.3)   5.9  
Amounts reclassified from accumulated other comprehensive (loss) income (4.3) 1.0 (9.8) (2.8)
Net current period other comprehensive (loss) income (18.7) (30.0) (0.8) 22.4
Ending Balance $ 36.6 $ (2.2) $ 36.6 $ (2.2)