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Rowan Transaction Assets Acquired and Liabilities Assumed (Details) - Rowan Companies [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Apr. 11, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]        
Business Combination, Acquired Receivables, Gross Contractual Amount     $ 208.3  
Assets:        
Cash and cash equivalents     931.9  
Accounts receivable     200.2  
Other current assets     99.0  
Long-term notes receivable from ARO     454.5  
Investment in ARO     141.3  
Property and equipment     2,963.8  
Other assets     42.8  
Liabilities:        
Accounts payable and accrued liabilities     275.1  
Current portion of long-term debt     203.2  
Long-term debt     1,910.9  
Other liabilities     410.8  
Net assets acquired     2,033.5  
Less: Merger consideration     (1,402.8)  
Bargain purchase gain   $ 53.0 630.7 $ 659.8
Previously Reported [Member]        
Assets:        
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      
Liabilities:        
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)      
Bargain purchase gain $ 712.8      
Revision of Prior Period, Adjustment [Member]        
Assets:        
Cash and cash equivalents     0.0  
Accounts receivable     (6.9)  
Other current assets     (2.6)  
Long-term notes receivable from ARO     0.0  
Investment in ARO     2.5  
Property and equipment     (26.0)  
Other assets     1.1  
Liabilities:        
Accounts payable and accrued liabilities     15.7  
Current portion of long-term debt     0.0  
Long-term debt     0.0  
Other liabilities     34.5  
Net assets acquired     (82.1)  
Less: Merger consideration     0.0  
Bargain purchase gain     $ (82.1)