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Acquisitions and Divestitures - Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 15, 2018
Aug. 02, 2017
Mar. 31, 2018
Feb. 28, 2019
Business Acquisition [Line Items]        
Acquisition price of an office building   $ 10.0    
Acquisition of property for future expansion       $ 2.0
Texas | Other Expense        
Business Acquisition [Line Items]        
Impairment charge     $ 1.6  
Sooner Acquisition        
Business Acquisition [Line Items]        
Purchase consideration of oil and gas properties $ 38.7      
Transaction costs capitalized $ 0.3