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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 1,800.0  
Net Carrying Value 1,787.8 $ 1,787.2
4.000% Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 500.0  
Issuance Date 2015-06  
Maturity Date 2025-06  
Net Carrying Value $ 496.8 496.6
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 $ 597.3 597.1
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 $ 693.7 $ 693.5