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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]          
OPERATING REVENUES $ 643.1 $ 455.1 $ 1,778.2 $ 1,300.4  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Asset Impairment Charges 0.0   0.0    
Depreciation expense 31.7 25.8 88.2 73.6  
General and administrative 30.6 24.2 89.6 75.0  
Operating Income (Loss) 94.9 16.6 233.1 15.2  
OTHER INCOME (EXPENSE), NET (7.7) 11.1 13.3 30.7  
INCOME TAX PROVISION 24.3 10.7 7.2 7.6  
NET INCOME ATTRIBUTABLE TO VALARIS 64.6 12.9 239.7 30.2  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 379.3   379.3   $ 620.5
    Other current assets 163.5   163.5   177.2
Total assets 4,333.4   4,333.4   4,322.2
Liabilities, Current 692.3   692.3   744.3
Total liabilities 2,209.6   2,209.6   2,325.2
Investment Owned, Balance [Abstract]          
Equity in earnings (losses) of ARO (23.8) 2.4 (21.7) 5.0  
ARO          
Investment Owned, Balance [Abstract]          
50% interest in ARO net loss (27.0) (0.6) (31.2) (3.9)  
Amortization of basis differences 3.2 3.0 9.5 8.9  
Equity in earnings (losses) of ARO (23.8) 2.4 (21.7) 5.0  
ARO          
Schedule of Equity Method Investments [Line Items]          
OPERATING REVENUES 113.7 121.5 376.2 362.9  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Contract drilling (exclusive of depreciation) 93.8 92.0 286.2 277.9  
Asset Impairment Charges 28.4 0.0 28.4 0.0  
Depreciation expense 21.1 15.8 59.8 46.4  
General and administrative 4.9 5.6 16.2 15.9  
Operating Income (Loss) (34.5) 8.1 (14.4) 22.7  
OTHER INCOME (EXPENSE), NET 15.3 9.0 41.8 28.2  
INCOME TAX PROVISION 4.2 0.4 6.1 2.3  
NET INCOME ATTRIBUTABLE TO VALARIS (54.0) $ (1.3) (62.3) $ (7.8)  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 129.3   129.3   92.9
    Other current assets 129.4   129.4   184.0
Non-current assets 1,223.3   1,223.3   1,081.0
Total assets 1,482.0   1,482.0   1,357.9
Liabilities, Current 200.7   200.7   136.0
Liabilities, Noncurrent 1,176.9   1,176.9   1,056.8
Total liabilities $ 1,377.6   $ 1,377.6   $ 1,192.8