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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Jun. 30, 2015
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
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    
Short-term debt       $ 350,000,000 525,000,000    
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       $ 680,000,000 320,000,000    
Line of Credit Facility, Maximum Borrowing Capacity       $ 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 to mature 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. In March 2019, the Company amended the $525 million term loan to decrease the borrowings from $525 million to $350 million and extend the maturity date to March 2020. All other terms and conditions on the amended term loan remain the same as the previous $525 million term loan.      
Term loan maturity period       2020-03      
Term loan, outstanding borrowings       $ 350,000,000 525,000,000    
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%.      
Term Loan Facility [Member] | Previously Reported [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price       $ 525,000,000      
Term Loan Facility [Member] | Restatement Adjustment [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price       350,000,000      
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       595,300,000 595,000,000    
2015 Senior Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, price     $ 900,000,000        
Senior notes, outstanding amount       $ 894,400,000 $ 894,000,000    
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