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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Jun. 30, 2015
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2016
Debt Instrument [Line Items]              
Term loan maturity period   2019-03          
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital       $ 23,500,000   $ 23,500,000  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding       $ 0   0  
LIBOR [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Interest rate over LIBOR       0.90%      
LIBOR [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Interest rate over LIBOR       1.50%      
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Term loan, outstanding borrowings       $ 320,000,000   615,000,000  
Line of Credit Facility, Maximum Borrowing Capacity       1,250,000,000   1,250,000,000  
Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price   $ 525,000,000     $ 350,000,000    
Debt instrument, description   In March 2018, the Company entered into a $350 million term loan for general corporate purposes that matures in March 2019. In August 2018, the Company amended its existing $350 million term loan to increase the borrowings under the term loan from $350 million to $525 million. All other terms and conditions on the amended term loan remain the same as the previous $350 million term loan.          
Debt Instrument, Description of Variable Rate Basis   Interest rates under the term loan are variable based on LIBOR at the time of the borrowing and the Company’s long-term credit rating and can range from LIBOR + 0.625% to LIBOR + 1.25%.          
2018 Senior Notes [Member] | Notes due 2023 [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price $ 600,000,000            
Senior unsecured notes, maturity year 2023            
Senior unsecured notes, coupon rate 4.00%            
Senior notes, outstanding amount       595,000,000      
2015 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price     $ 900,000,000        
Senior notes, outstanding amount       894,000,000   $ 892,600,000  
2015 Senior Notes [Member] | Notes Due 2020 [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price     $ 400,000,000        
Senior unsecured notes, maturity year     2020        
Senior unsecured notes, coupon rate     3.00%        
Senior unsecured notes, maturity period     5 years        
2015 Senior Notes [Member] | Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price     $ 500,000,000        
Senior unsecured notes, maturity year     2025        
Senior unsecured notes, coupon rate     4.00%        
Senior unsecured notes, maturity period     10 years        
Amended and Restated Credit Agreement [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 1,250,000,000
Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term debt payments in 2019       0      
Long-term debt payments in 2020       400,000,000      
Long-term debt payments in 2021       0      
Long-term debt payments in 2022       600,000,000      
Long-term debt payments in 2023       $ 600,000,000