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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
OPERATING REVENUES $ 430.1 $ 318.4  
Contract drilling (exclusive of depreciation) 377.2 331.3  
Depreciation expense 23.3 22.5  
General and administrative 24.4 18.8  
Operating Income (Loss) 8.5 (49.9)  
OTHER INCOME (EXPENSE), NET 12.5 9.4  
INCOME TAX PROVISION (27.6) (0.7)  
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS 46.7 (38.6)  
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents 822.5   $ 724.1
    Other current assets 158.1   148.6
Total assets 2,951.2   2,860.3
Liabilities, Current 591.8   504.4
Total liabilities 1,599.2   1,562.4
Investment Owned, Balance [Abstract]      
Equity in earnings of ARO 3.3 4.3  
ARO      
Investment Owned, Balance [Abstract]      
50% interest in ARO net income 0.4 0.7  
Amortization of basis differences 2.9 3.6  
Equity in earnings of ARO 3.3 4.3  
ARO      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
OPERATING REVENUES 123.6 111.3  
Contract drilling (exclusive of depreciation) 90.9 84.2  
Depreciation expense 15.0 16.5  
General and administrative 4.6 5.2  
Operating Income (Loss) 13.1 5.4  
OTHER INCOME (EXPENSE), NET 10.4 3.3  
INCOME TAX PROVISION 1.9 0.7  
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS 0.8 $ 1.4  
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents 101.2   176.2
    Other current assets 189.3   140.6
Non-current assets 830.2   818.1
Total assets 1,120.7   1,134.9
Liabilities, Current 68.5   86.3
Liabilities, Noncurrent 887.4   884.6
Total liabilities $ 955.9   $ 970.9