v3.10.0.1
Long-Term Debt - Additional Information (Details) - Five-Year Senior Unsecured Revolving Credit Facility - USD ($)
1 Months Ended
Aug. 31, 2018
Jul. 31, 2016
Dec. 31, 2018
Feb. 28, 2018
Dec. 31, 2016
Line Of Credit Facility [Line Items]          
Credit facility expiration period   5 years      
Maximum borrowing capacity $ 1,050,000,000 $ 1,100,000,000   $ 1,250,000,000 $ 1,200,000,000
Annual commitment fee   0.10%      
Origination fees   $ 0      
Credit facility expiration date 2023-08        
Amounts outstanding under the credit facility     $ 0    
LIBOR          
Line Of Credit Facility [Line Items]          
Basis spread on variable interest rate (percentage)   0.75%