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Fair Value Measurements - Financial Instruments (Details) - USD ($)
Sep. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Fair Value      
Debt issuance costs $ 28,900,000   $ 32,600,000
Amarillo Rattler, LLC      
Fair Value      
Installment payable   $ 10,000,000  
Business combination, maximum earnout   $ 15,000,000  
Carrying Value      
Fair Value      
Long-term debt 4,392,600,000   4,593,800,000
Installment payable 10,000,000.0   0
Contingent consideration fair value 6,900,000   0
Fair Value      
Fair Value      
Long-term debt 4,466,700,000   4,318,200,000
Installment payable 10,000,000.0   0
Contingent consideration fair value $ 6,900,000   $ 0