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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Equity Method Investment, Summarized Financial Information [Abstract]            
Assets, Current $ 1,066,100,000     $ 1,066,100,000   $ 1,064,400,000
Total assets 13,038,900,000     13,038,900,000   16,931,200,000
Liabilities, Current 3,068,100,000     3,068,100,000   830,700,000
Investment Owned, Balance [Abstract]            
Equity in earnings of ARO (5,200,000)   $ 600,000 (11,500,000) $ 600,000  
ARO            
Equity Method Investment, Summarized Financial Information [Abstract]            
Assets, Current 593,700,000     593,700,000   623,500,000
Total liabilities 0     0   700,000
Maximum exposure to loss 593,700,000     593,700,000   622,800,000
Investment Owned, Balance [Abstract]            
50% interest in ARO net income 3,300,000 $ 8,400,000   4,900,000    
Amortization of basis differences (8,500,000) (7,800,000)   (16,400,000)    
Equity in earnings of ARO (5,200,000) 600,000   (11,500,000)    
ARO            
Related Party Transactions [Abstract]            
Lease revenue 19,900,000 18,300,000   41,400,000    
Secondment and Transition Revenue, Related Party 200,000 20,800,000   22,000,000.0    
Total revenue from ARO 20,100,000 39,100,000   63,400,000    
ARO            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment Summarized Fin Information Revenue 146,000,000.0 123,800,000   286,300,000    
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]            
Contract drilling (exclusive of depreciation) 112,500,000 78,900,000   220,800,000    
Depreciation 13,300,000 12,400,000   26,300,000    
General and administrative 7,100,000 5,300,000   15,400,000    
Operating income 13,100,000 27,200,000   23,800,000    
Other expense, net 6,700,000 8,700,000   13,300,000    
Provision (Benefit) for income taxes (200,000) 1,700,000   700,000    
Equity Method Investment Summarized Fin Information Net Income Loss 6,600,000 $ 16,800,000   9,800,000    
Equity Method Investment, Summarized Financial Information [Abstract]            
Assets, Current 349,200,000     349,200,000   407,200,000
Assets, Noncurrent 924,100,000     924,100,000   874,800,000
Total assets 1,273,300,000     1,273,300,000   1,282,000,000.0
Liabilities, Current 206,800,000     206,800,000   183,200,000
Liabilities, Noncurrent 973,400,000     973,400,000   1,015,500,000
Total liabilities $ 1,180,200,000     $ 1,180,200,000   $ 1,198,700,000