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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Investment Owned, Balance [Abstract]          
Equity in earnings of ARO $ (3,700,000) $ 0   $ (3,100,000) $ 0
Notes Receivable [Abstract]          
Notes Receivable, Related Parties 452,900,000   $ 452,900,000 452,900,000  
ARO          
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]          
Total assets 663,300,000   663,300,000 663,300,000  
Total liabilities 3,000,000.0   3,000,000.0 3,000,000.0  
Maximum exposure to loss 660,300,000   660,300,000 660,300,000  
Investment Owned, Balance [Abstract]          
50% interest in ARO net income 5,100,000   13,600,000    
Amortization of basis differences (8,800,000)   (16,700,000)    
Equity in earnings of ARO (3,700,000)   (3,100,000)    
ARO          
Related Party Transactions [Abstract]          
Lease revenue 19,900,000   37,000,000.0    
Secondment revenue 17,900,000   33,500,000    
Transition Services revenue 5,000,000.0   10,200,000    
Total revenue from ARO 42,800,000   80,700,000    
ARO          
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Revenues 138,400,000   262,200,000    
Contract drilling (exclusive of depreciation) 92,700,000   171,700,000    
Depreciation 14,600,000   26,900,000    
General and administrative 8,800,000   13,900,000    
Operating income 22,300,000   49,700,000    
Other expense, net 9,900,000   18,800,000    
Provision for income taxes 2,200,000   3,800,000    
Net income 10,200,000   27,100,000    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]          
Current assets 452,800,000   452,800,000 452,800,000  
Non-current assets 887,100,000   887,100,000 887,100,000  
Total assets 1,339,900,000   1,339,900,000 1,339,900,000  
Current liabilities 232,400,000   232,400,000 232,400,000  
Non-current liabilities 1,021,700,000   1,021,700,000 1,021,700,000  
Total liabilities 1,254,100,000   1,254,100,000 1,254,100,000  
October 2027          
Notes Receivable [Abstract]          
Notes Receivable, Related Parties 275,200,000   275,200,000 275,200,000  
October 2028          
Notes Receivable [Abstract]          
Notes Receivable, Related Parties $ 177,700,000   $ 177,700,000 $ 177,700,000