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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Principal Amount $ 3,300.0  
Net Carrying Value 2,669.4 $ 2,673.5
4.000% Senior Notes [Member] | 2015 Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 500.0  
Issuance Date 2015-06  
Maturity Date 2025-06  
Net Carrying Value $ 498.7 498.1
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 $ 0.0 599.2
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 $ 446.1 445.8
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 $ 695.5 695.0
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 $ 435.8 435.4
5.875% Senior Notes [Member] | 2023 Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 600.0  
Issuance Date 2023-06  
Maturity Date 2033-06  
Net Carrying Value $ 593.3 $ 0.0