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Debt and Financing Obligations - Credit Facility (Details) - USD ($)
3 Months Ended 6 Months Ended
May 07, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 06, 2020
Dec. 31, 2019
Debt and Financing Obligations              
Reduction in total aggregate commitment $ 130,000,000.0            
Current portion   $ 41,700,000   $ 41,700,000     $ 148,900,000
Outstanding letters of credit   39,900,000   39,900,000      
Credit Agreement              
Debt and Financing Obligations              
Total available commitments   $ 1,170,000,000   $ 1,170,000,000   $ 1,300,000,000  
Reduction in total aggregate commitment $ 130,000,000.0            
Number of line of credit facilities       2      
Average interest rates (as a percent)   2.80% 4.50% 3.10% 4.60%    
Total borrowings outstanding   $ 404,700,000   $ 404,700,000      
Total remaining availability for borrowings and letters of credit   725,400,000   725,400,000      
General Secured Indebtedness Basket [Member] | Eurocurrency/Eurodollar rate | Minimum              
Debt and Financing Obligations              
Interest rate margin (as a percent) 0.75%            
General Secured Indebtedness Basket [Member] | Cost of funds rate | Minimum              
Debt and Financing Obligations              
Interest rate margin (as a percent) 0.50%            
Working Capital Facility [Member]              
Debt and Financing Obligations              
Total available commitments $ 770,000,000.0 770,000,000.0   770,000,000.0   850,000,000.0  
Current portion   41,700,000   41,700,000     148,900,000
Long-term portion   175,000,000.0   175,000,000.0     175,000,000.0
Net reduction in credit facility       107,200,000 $ (102,800,000)    
Revolving Credit Facility [Member]              
Debt and Financing Obligations              
Total available commitments $ 400,000,000.0 400,000,000.0   400,000,000.0   $ 450,000,000.0  
Total borrowings outstanding   $ 188,000,000.0   188,000,000.0      
Net reduction in credit facility       $ 4,700,000 $ 8,000,000    
Letter of credit              
Debt and Financing Obligations              
Total remaining availability for borrowings and letters of credit             $ 660,200,000