Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement (Details)

v3.20.2
Fair Value Measurement (Details)
$ in Millions
1 Months Ended
Sep. 30, 2015
USD ($)
bbl
Sep. 30, 2020
USD ($)
Mar. 31, 2020
Jan. 31, 2020
USD ($)
Mar. 12, 2019
Feb. 25, 2019
USD ($)
5.75% Senior Notes Due 2027            
Fair value measurement            
Debt instrument fair value           $ 653.3
Level 2 | 5.375% Senior Notes due 2024            
Fair value measurement            
Debt instrument fair value   $ 554.0        
Level 2 | 5.75% Senior Notes Due 2027            
Fair value measurement            
Debt instrument fair value   536.0        
Level 2 | 5.75% Senior Notes Due 2028            
Fair value measurement            
Debt instrument fair value   $ 533.0        
Recurring | Discounted cash flow | Level 3 | Weighted Average            
Fair value measurement            
Business combination cost of capital         0.141  
Recurring | Discounted cash flow, comparable company and market value | Level 3 | Weighted Average            
Fair value measurement            
Goodwill cost of capital     0.180      
Recurring | Discount rate | Third-party market participants            
Fair value measurement            
Property and Equipment discount rate     0.190      
Contingent Consideration Period One            
Fair value measurement            
Contingent consideration $ 125.0     $ 125.0    
Threshold number of barrels of water to trigger contingent consideration payment | bbl 176,295,000          
Contribution Agreement | Contingent Consideration Period Two            
Fair value measurement            
Contingent consideration $ 125.0          
Threshold number of barrels of water to trigger contingent consideration payment | bbl 219,200,000