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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
ASSETS          
Cash and cash equivalents $ 607.6 $ 608.7 $ 724.1 $ 608.7  
Other 90.5 117.8 148.6 117.8  
TOTAL ASSETS 2,595.6 2,603.1 2,860.3 2,603.1  
Liabilities [Abstract]          
Liabilities, Current 390.6 422.0 504.4 422.0  
Investment Owned, Balance [Abstract]          
EQUITY IN EARNINGS (LOSSES) OF ARO 3.1 6.1 24.5   $ (7.8)
ARO          
Related Party Transactions [Abstract]          
Lease revenue 21.7 35.4 56.7   52.2
Secondment revenue 1.1 1.5 2.0   21.6
Total revenue from ARO (1) 22.8 36.9 58.7   73.8
ARO          
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Equity Method Investment Summarized Fin Information Revenue     459.5 470.6 549.4
Equity Method Investment Summarized Financial Information Contract Drilling     341.8 362.3 388.2
Equity Method Investment Summarized Financial Information Depreciation     63.4 65.2 54.8
Equity Method Investment Summarized Financial Information General And Administrative Expense     18.7 17.8 24.2
Equity Method Investment Summarized Financial Information Operating Income     35.6 25.3 82.2
Equity Method Investment Summarized Financial Information Other Expense, Net     11.1 13.4 26.7
Equity Method Investment Summarized Financial Information Provision For Income Taxes     3.8 7.9 14.2
Equity Method Investment Summarized Fin Information Net Income Loss     20.7 4.0 41.3
ASSETS          
Cash and cash equivalents   270.8 176.2 270.8  
Other   135.0 140.6 135.0  
Assets, Noncurrent   775.8 818.1 775.8  
TOTAL ASSETS   1,181.6 1,134.9 1,181.6  
Liabilities [Abstract]          
Liabilities, Current   79.9 86.3 79.9  
Liabilities, Noncurrent   956.7 884.6 956.7  
Liabilities   1,036.6 970.9 1,036.6  
Maximum exposure to loss   299.0 317.9 299.0  
Related Party Transactions [Abstract]          
Equity Method Investment, Maximum Exposure, Assets   348.1 377.8 348.1  
Equity Method Investment, Maximum Exposure, Liabilities   49.1 59.9 $ 49.1  
ARO          
Investment Owned, Balance [Abstract]          
50% interest in ARO net income (loss) 6.0 (4.0) 10.4   20.7
Amortization of basis differences (2.9) 10.1 14.1   (28.5)
EQUITY IN EARNINGS (LOSSES) OF ARO $ 3.1 $ 6.1 $ 24.5   $ (7.8)