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Long-Term Debt - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 21, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]              
Repayments of commercial paper notes       $ 213,300      
Net investment hedge gains (losses)   $ 22,989 $ (14,234) $ 8,568 $ (27,919)    
Commercial paper notes              
Debt Instrument [Line Items]              
Weighted average interest rate   2.44%   2.44%      
Debt instrument maturity period       37 days      
1.875% Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, interest rate   1.875%   1.875%   1.875% 1.875%
Revolving Credit Facility              
Debt Instrument [Line Items]              
Revolving credit facility, maximum borrowing capacity $ 1,000,000            
Interest rate margin       1.125%      
Revolving credit facility, borrowings outstanding   $ 0   $ 0      
Minimum | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate margin 0.91%            
Maximum | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate margin 1.50%