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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
OPERATING REVENUES $ 525.0 $ 430.1  
Depreciation expense 26.8 23.3  
General and administrative 26.5 24.4  
Operating Income (Loss) 29.3 8.5  
OTHER INCOME (EXPENSE), NET 9.1 12.5  
INCOME TAX PROVISION 12.9 (27.6)  
NET INCOME ATTRIBUTABLE TO VALARIS 25.5 46.7  
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents 494.1   $ 620.5
    Other current assets 177.6   177.2
Total assets 4,354.4   4,322.2
Liabilities, Current 760.7   744.3
Total liabilities 2,324.1   2,325.2
Investment Owned, Balance [Abstract]      
Equity in earnings of ARO 2.4 3.3  
ARO      
Investment Owned, Balance [Abstract]      
50% interest in ARO net income (loss) (0.8) 0.4  
Amortization of basis differences 3.2 2.9  
Equity in earnings of ARO 2.4 3.3  
ARO      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
OPERATING REVENUES 138.3 123.6  
Contract drilling (exclusive of depreciation) 98.3 90.9  
Depreciation expense 19.0 15.0  
General and administrative 5.8 4.6  
Operating Income (Loss) 15.2 13.1  
OTHER INCOME (EXPENSE), NET 13.1 10.4  
INCOME TAX PROVISION 3.7 1.9  
NET INCOME ATTRIBUTABLE TO VALARIS (1.6) $ 0.8  
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents 69.5   92.9
    Other current assets 198.3   184.0
Non-current assets 1,094.2   1,081.0
Total assets 1,362.0   1,357.9
Liabilities, Current 135.0   136.0
Liabilities, Noncurrent 1,057.6   1,056.8
Total liabilities $ 1,192.6   $ 1,192.8