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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   $ 2,200.0  
Net Carrying Value   2,185.1 $ 2,184.3
3.000% Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   $ 400.0  
Issuance Date   2015-06  
Maturity Date 2020-06 2020-06  
Net Carrying Value   $ 399.9 399.7
4.000% Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal Amount   $ 500.0  
Issuance Date   2015-06  
Maturity Date   2025-06  
Net Carrying Value   $ 496.0 495.8
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   $ 596.3 596.1
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   $ 692.9 $ 692.7