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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
OPERATING REVENUES $ 455.1 $ 437.2 $ 1,300.4 $ 1,168.9  
Depreciation expense 25.8 22.6 73.6 67.4  
General and Administrative Expense 24.2 19.2 75.0 57.0  
Operating Income (Loss) 16.6 61.6 15.2 (3.9)  
OTHER INCOME (EXPENSE), NET 11.1 29.9 30.7 187.9  
INCOME TAX PROVISION 10.7 13.8 7.6 33.3  
Net Income (Loss) Attributable to Parent, Total 12.9 74.3 30.2 147.3  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 1,041.1   1,041.1   $ 724.1
    Other current assets 178.7   178.7   148.6
Total assets 3,484.9   3,484.9   2,860.3
Liabilities, Current 723.0   723.0   504.4
Total liabilities 2,284.9   2,284.9   1,562.4
Investment Owned, Balance [Abstract]          
Equity in earnings of ARO 2.4 2.9 5.0 15.9  
ARO          
Investment Owned, Balance [Abstract]          
50% interest in ARO net income (loss) (0.6) (0.7) (3.9) 5.0  
Amortization of basis differences 3.0 3.6 8.9 10.9  
Equity in earnings of ARO 2.4 2.9 5.0 15.9  
ARO          
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
OPERATING REVENUES 121.5 111.4 362.9 339.1  
Contract drilling (exclusive of depreciation) 92.0 90.0 277.9 256.3  
Depreciation expense 15.8 15.4 46.4 47.3  
General and Administrative Expense 5.6 4.7 15.9 13.1  
Operating Income (Loss) 8.1 1.3 22.7 22.4  
OTHER INCOME (EXPENSE), NET 9.0 2.7 28.2 9.3  
INCOME TAX PROVISION 0.4 (0.1) 2.3 3.1  
Net Income (Loss) Attributable to Parent, Total (1.3) $ (1.3) (7.8) $ 10.0  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 110.3   110.3   176.2
    Other current assets 191.2   191.2   140.6
Non-current assets 915.3   915.3   818.1
Total assets 1,216.8   1,216.8   1,134.9
Liabilities, Current 173.6   173.6   86.3
Liabilities, Noncurrent 886.2   886.2   884.6
Total liabilities $ 1,059.8   $ 1,059.8   $ 970.9