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Long Term Debt - Credit Facility (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Repayment of credit facility $ 439,900,000            
Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity           $ 1,250,000,000  
Outstanding under credit facility         $ 0   $ 0
LIBOR | Minimum              
Debt Instrument [Line Items]              
Variable rate       1.25%      
LIBOR | Maximum              
Debt Instrument [Line Items]              
Variable rate       1.75%      
Prime Rate | Minimum              
Debt Instrument [Line Items]              
Variable rate       0.25%      
Prime Rate | Maximum              
Debt Instrument [Line Items]              
Variable rate       0.75%      
Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 300,000,000.0   $ 300,000,000.0      
Credit Agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit agreement, term 5 years            
Maximum borrowing capacity $ 1,100,000,000            
Repayment of credit facility   $ 250,000,000          
Negative covenant, company and subsidiaries additional capacity for secured debt 50,000,000.0            
Covenants, company and subsidiaries, unsecured debt maximum $ 100,000,000.0            
Debt covenant, consolidated interest expense ratio 3.50            
Covenant leverage ratio 3.25            
Debt, leverage covenant, consolidated total indebtedness to consolidated EBITDA ratio less than or equal     4.5        
Liquidity covenant, minimum $ 550,000,000.0            
Weighted average interest rate   2.10%   2.30% 3.60%    
Commitment fee percentage 0.40%     0.15%      
Debt financing costs   $ 7,200,000   $ 7,200,000      
Credit Agreement | Revolving Credit Facility | Quarter ending September 30, 2021              
Debt Instrument [Line Items]              
Debt, leverage covenant, consolidated total indebtedness to consolidated EBITDA ratio less than or equal 4.5            
Credit Agreement | Revolving Credit Facility | Quarter ending December 31, 2021              
Debt Instrument [Line Items]              
Debt, leverage covenant, consolidated total indebtedness to consolidated EBITDA ratio less than or equal 4.0            
Credit Agreement | Revolving Credit Facility | Quarter ending March, 31, 2022              
Debt Instrument [Line Items]              
Debt, leverage covenant, consolidated total indebtedness to consolidated EBITDA ratio less than or equal 3.5            
Covenant, consolidated EBITDA to consolidated interest expense ratio, greater than or equal 3.5            
Credit Agreement | LIBOR              
Debt Instrument [Line Items]              
Variable rate 2.00%            
Credit Agreement | Base Rate              
Debt Instrument [Line Items]              
Variable rate 1.00%            
Letter of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 50,000,000.0            
Letters of credit outstanding   $ 15,500,000   $ 15,500,000 $ 5,100,000   $ 5,000,000.0