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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Debt Instrument [Line Items]              
Aggregate outstanding notes $ 2,200.0   $ 2,200.0        
Repayment of long-term debt     955.0 $ 1,610.0      
Term loan maturity period   2019-03          
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital 23.5   23.5     $ 23.5  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding 0.0   $ 0.0     0.0  
Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price   $ 350.0     $ 350.0   $ 525.0
Repayment of long-term debt 350.0            
Term loan maturity period     2020-03        
Term loan, outstanding borrowings 0.0   $ 0.0     525.0  
Debt instrument, description     In March 2018, the Company entered into a $350 million term loan (the “Term Loan”), the borrowings thereunder were used for general corporate purposes. The Term Loan was amended in August 2018 to increase the borrowings to $525 million and further amended in March 2019 to decrease the borrowings to $350 million and extend the maturity date to March 2020.         
2019 Senior Notes [Member] | Notes due 2029 [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price $ 700.0   $ 700.0        
Senior unsecured notes, maturity year 2029            
Senior unsecured notes, coupon rate 3.25%   3.25%        
2019 Revolving Credit Agreement [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 1,250.0   $ 1,250.0        
Term loan maturity period     2024-09        
Rollover amount from prior credit facility included in current facility 165.0   $ 165.0        
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 $ 165.0   $ 165.0     $ 320.0  
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%