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Rowan Transaction Assets Acquired Liabilities Assumed (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 11, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liabilities:        
Current Portion of Long term debt   $ 203.2    
Long-term Debt   1,910.9    
Bargain purchase gain   637.0 $ 1.8 $ 140.2
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   203.5    
Other current assets   99.2    
Long -term notes receivable from ARO   454.5    
Investment in ARO   141.3    
Property and equipment   2,964.0    
Other assets   43.0    
Liabilities:        
Accounts payable and accrued liabilities   273.1    
Other liabilities   410.4    
Net assets acquired   2,039.8    
Less: Merger consideration (1,400.0) (1,402.8)    
Bargain purchase gain   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   (3.6)    
Other current assets   (2.4)    
Long -term notes receivable from ARO   0.0    
Investment in ARO   2.5    
Property and equipment   (25.8)    
Other assets   1.3    
Liabilities:        
Accounts payable and accrued liabilities   0.0    
Current Portion of Long term debt   13.7    
Long-term Debt   0.0    
Other liabilities   34.1    
Net assets acquired   (75.8)    
Less: Merger consideration   0.0    
Bargain purchase gain   $ (75.8)