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Consolidated Joint Ventures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 03, 2019
Mar. 31, 2019
Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]      
Percentage attributable to noncontrolling interests     50.00%
Bully Joint Venture      
Schedule Of Equity Method Investments [Line Items]      
Equity interest 50.00%    
Payments to to acquire interest $ 106.7    
Dividends approved   $ 10.0  
Subsidiary of Shell      
Schedule Of Equity Method Investments [Line Items]      
Proceeds from contract termination $ 166.9