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Rowan Transaction Assets Acquired Liabilities Assumed (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 11, 2019
Dec. 31, 2020
Dec. 31, 2019
Liabilities:      
Current Portion of Long term debt   $ 203.2  
Long-term Debt   1,910.9  
Business Combination, Bargain Purchase, Adjustment (Gain) Loss   6.3 $ 75.8
Rowan Companies [Member]      
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  
Other liabilities   410.8  
Net assets acquired   2,033.5  
Less: Merger consideration (1,400.0) (1,402.8)  
Bargain purchase gain   630.7 $ 637.0
Rowan Companies [Member] | 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 203.2    
Current Portion of Long term debt 259.4    
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    
Rowan Companies [Member] | Restatement 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   0.0  
Current Portion of Long term debt   15.7  
Long-term Debt   0.0  
Other liabilities   34.5  
Net assets acquired   (82.1)  
Less: Merger consideration   0.0  
Bargain purchase gain   $ (82.1)