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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Principal Amount $ 2,700.0  
Net Carrying Value 2,670.6 $ 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 $ 497.5 497.4
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 $ 598.4 598.2
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 $ 445.3 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 $ 694.4 $ 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