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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]        
Total operating revenues   $ 1,427.2 $ 2,053.2 $ 1,705.4
Contract drilling (exclusive of depreciation)   1,458.6 1,806.0 1,319.4
Other expense, net   (794.3) 604.2 (303.0)
Depreciation expense   540.8 609.7 478.9
General and administrative   214.6 188.9 102.7
OPERATING LOSS   (4,322.7) (668.0) (235.9)
NET LOSS   (4,857.6) (192.2) (636.6)
Total provision for income taxes   (259.4) 128.4 89.6
Assets:        
Total current assets $ 1,064.4 1,172.9 1,064.4  
TOTAL ASSETS 16,931.2 12,873.2 16,931.2  
Liabilities:        
Liabilities, Current 830.7 426.8 830.7  
Investment Owned, Balance [Abstract]        
EQUITY IN LOSSES OF ARO   (7.8) (12.6) $ 0.0
ARO        
Related Party Transactions [Abstract]        
Lease revenue 58.2 52.2    
Secondment revenue 49.9 21.6    
Transition Services revenue 17.3 1.3    
Total revenue from ARO (1) 125.4 75.1    
ARO        
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]        
Total operating revenues 410.5 549.4    
Contract drilling (exclusive of depreciation) 280.2 388.2    
Other expense, net 28.6 26.7    
Depreciation expense 40.3 54.8    
General and administrative 27.1 24.2    
OPERATING LOSS 62.9 82.2    
NET LOSS 24.6 41.3    
Total provision for income taxes 9.7 14.2    
Assets:        
Total current assets 407.2 358.6 407.2  
Assets, Noncurrent 874.8 804.0 874.8  
TOTAL ASSETS 1,282.0 1,162.6 1,282.0  
Liabilities:        
Liabilities, Current 183.2 70.8 183.2  
Liabilities, Noncurrent 1,015.5 950.8 1,015.5  
Liabilities 1,198.7 1,021.6 1,198.7  
ARO        
Assets:        
Total current assets 623.5 585.2 623.5  
Liabilities:        
Liabilities 0.7 30.9 0.7  
Investment Owned, Balance [Abstract]        
50% interest in ARO net income 12.3 20.7    
Amortization of basis differences (24.9) (28.5)    
EQUITY IN LOSSES OF ARO (12.6) (7.8)    
Related Party Transactions [Abstract]        
Equity Method Investment, Maximum Loss Exposure $ 622.8 $ 554.3 $ 622.8