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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Principal Amount $ 2,700.0    
Net Carrying Value 2,671.5   $ 1,789.8
Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   $ 900.0  
4.000% Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 500.0    
Issuance Date 2015-06    
Maturity Date 2025-06    
Net Carrying Value $ 497.7   497.4
4.000% Senior Notes [Member] | 2018 Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 600.0    
Issuance Date 2018-09    
Maturity Date 2023-09    
Net Carrying Value $ 598.8   598.2
4.000% Senior Notes [Member] | 2022 Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 450.0    
Issuance Date 2022-03    
Maturity Date 2032-03    
Net Carrying Value $ 445.4   0.0
4.000% Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   450.0  
3.250% Senior Notes [Member] | 2019 Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 700.0    
Issuance Date 2019-09    
Maturity Date 2029-09    
Net Carrying Value $ 694.6   $ 694.2
4.500% Senior Notes [Member] | 2022 Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount $ 450.0    
Issuance Date 2022-03    
Maturity Date 2052-03    
Net Carrying Value $ 435.0    
4.500% Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   $ 450.0