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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2020
Sep. 30, 2019
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Aggregate outstanding notes     $ 1,800.0  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital     17.5 $ 17.5
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding     0.0 0.0
2020 Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0      
Term loan maturity period 2021-04      
2019 Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,250.0    
Term loan maturity period   2024-09    
Debt Instrument, Description of Variable Rate Basis   Interest rates under the 2019 Revolving Credit Agreement are variable based on LIBOR at the time of the borrowing and the Company’s long-term credit rating and can range from LIBOR + 0.91% to LIBOR + 1.4%.    
Term loan, outstanding borrowings     $ 820.0 $ 785.0
2019 Revolving Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Interest rate over LIBOR   0.91%    
2019 Revolving Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Interest rate over LIBOR   1.40%