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Rowan Transaction Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Apr. 11, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Estimated bargain purchase gain     $ 659.8 $ 1.8
Gross contractual amounts receivable $ 208.3      
Rowan Companies        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash and cash equivalents 931.9      
Accounts receivable 204.5      
Other current assets 101.6      
Long-term notes receivable from ARO 454.5      
Investment in ARO 141.3      
Property and equipment 2,975.6      
Other assets 39.9      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Accounts payable and accrued liabilities 259.1      
Current portion of long-term debt 203.2      
Long-term debt 1,910.9      
Other liabilities 413.5      
Net assets acquired 2,062.6      
Less: Merger consideration (1,402.8)      
Estimated bargain purchase gain   $ 53.0 $ 659.8  
Previously Reported | Rowan Companies        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash and cash equivalents 931.9      
Accounts receivable 207.1      
Other current assets 101.6      
Long-term notes receivable from ARO 454.5      
Investment in ARO 138.8      
Property and equipment 2,989.8      
Other assets 41.7      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Accounts payable and accrued liabilities 259.4      
Current portion of long-term debt 203.2      
Long-term debt 1,910.9      
Other liabilities 376.3      
Net assets acquired 2,115.6      
Less: Merger consideration (1,402.8)      
Estimated bargain purchase gain 712.8      
Restatement Adjustment | Rowan Companies        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]        
Cash and cash equivalents 0.0      
Accounts receivable (2.6)      
Other current assets 0.0      
Long-term notes receivable from ARO 0.0      
Investment in ARO 2.5      
Property and equipment (14.2)      
Other assets (1.8)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]        
Accounts payable and accrued liabilities (0.3)      
Current portion of long-term debt 0.0      
Long-term debt 0.0      
Other liabilities 37.2      
Net assets acquired (53.0)      
Less: Merger consideration 0.0      
Estimated bargain purchase gain $ (53.0)