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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Apr. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Aggregate outstanding notes     $ 1,800,000,000    
Repayment of long-term debt     1,120,000,000.0 $ 955,000,000.0  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital     17,500,000   $ 17,500,000
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding     0   0
Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price   $ 350,000,000   350,000,000  
Repayment of long-term debt   $ 350,000,000      
Term loan, outstanding borrowings         0
Term loan maturity period   2020-03      
Debt instrument, description   In September 2019, the Company used the proceeds from the 2019 Notes to repay the full outstanding balance on the Term Loan entered into in March 2018 and subsequently amended in August 2018 and March 2019 (the “Term Loan”).  Following the March 2019 amendment, the Term Loan provided for borrowings of $350 million and matured in March 2020. At December 31, 2019, amounts due under the Term Loan were zero.      
3.000% Senior Notes [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price     $ 400,000,000.0    
Senior unsecured notes, coupon rate     3.00%    
Maturity date     2020-06    
Issuance Date     2015-06    
2019 Senior Notes [Member] | Notes due 2029 [Member]          
Debt Instrument [Line Items]          
Senior unsecured notes, price   $ 700,000,000   $ 700,000,000  
Senior unsecured notes, maturity year   2029      
Senior unsecured notes, coupon rate   3.25%   3.25%  
2020 Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000,000        
Debt Instrument, Description of Variable Rate Basis Interest rates under the 2020 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 + 1.4% to LIBOR + 1.8%.        
Debt instrument, covenant description The 2020 Revolving Credit Agreement includes a covenant under which the Company is required to maintain a minimum ratio of consolidated EBITDA to consolidated interest expense of 3.0 to 1.0.  Consolidated EBITDA is defined as consolidated net income before interest expense, income taxes, depreciation, amortization of intangible assets, losses from asset impairments, and certain other one-time adjustments. In addition, the 2020 Revolving Credit Agreement includes a covenant under which the Company’s ratio of consolidated total indebtedness minus certain cash and cash equivalents to consolidated EBITDA generally may not exceed 3.5 to 1.0.  As of  September 30, 2020        
Required minimum ratio of consolidated EBITDA to consolidated interest expense 3.0        
Ratio of consolidated debt minus certain cash and cash equivalents to consolidated EBITDA 3.5        
Term loan, outstanding borrowings     $ 0    
2020 Revolving Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR 1.40%        
2020 Revolving Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate over LIBOR 1.80%        
2019 Revolving Credit Agreement [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,250,000,000   $ 1,250,000,000  
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     $ 300,000,000.0   $ 0
Term loan maturity period   2024-09      
Rollover amount from prior credit facility included in current facility   $ 165,000,000.0   $ 165,000,000.0  
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%