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Segment Information - Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Segment Reporting    
Total identifiable assets $ 8,566.5 $ 8,550.9
Permian    
Segment Reporting    
Total identifiable assets 2,387.5 2,236.3
Louisiana    
Segment Reporting    
Total identifiable assets 2,349.2 2,312.4
Oklahoma    
Segment Reporting    
Total identifiable assets 2,698.8 2,847.6
North Texas    
Segment Reporting    
Total identifiable assets 960.9 1,008.6
Corporate    
Segment Reporting    
Total identifiable assets $ 170.1 $ 146.0