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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
OPERATING REVENUES $ 415.2 $ 413.3 $ 845.3 $ 731.7  
Depreciation expense 24.5 22.3 47.8 44.8  
General and administrative 26.4 19.0 50.8 37.8  
Operating Income (Loss) (9.9) (15.6) (1.4) (65.5)  
OTHER INCOME (EXPENSE), NET 7.1 148.6 19.6 158.0  
INCOME TAX PROVISION 24.5 20.2 (3.1) 19.5  
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS (29.4) 111.6 17.3 73.0  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 787.3   787.3   $ 724.1
    Other current assets 168.7   168.7   148.6
Total assets 3,088.4   3,088.4   2,860.3
Liabilities, Current 658.9   658.9   504.4
Total liabilities 1,822.3   1,822.3   1,562.4
Investment Owned, Balance [Abstract]          
Equity in earnings (losses) of ARO (0.7) 8.7 2.6 13.0  
ARO          
Investment Owned, Balance [Abstract]          
50% interest in ARO net income (loss) (3.7) 5.0 (3.3) 5.7  
Amortization of basis differences 3.0 3.7 5.9 7.3  
Equity in earnings (losses) of ARO (0.7) 8.7 2.6 13.0  
ARO          
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
OPERATING REVENUES 117.8 116.4 241.4 227.7  
Contract drilling (exclusive of depreciation) 95.0 82.1 185.9 166.3  
Depreciation expense 15.6 15.4 30.6 31.9  
General and administrative 5.7 3.2 10.3 8.4  
Operating Income (Loss) 1.5 15.7 14.6 21.1  
OTHER INCOME (EXPENSE), NET 8.8 3.3 19.2 6.6  
INCOME TAX PROVISION 0.0 2.5 1.9 3.2  
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS (7.3) $ 9.9 (6.5) $ 11.3  
Equity Method Investment, Summarized Financial Information [Abstract]          
    Cash and cash equivalents 100.6   100.6   176.2
    Other current assets 188.3   188.3   140.6
Non-current assets 879.6   879.6   818.1
Total assets 1,168.5   1,168.5   1,134.9
Liabilities, Current 122.6   122.6   86.3
Liabilities, Noncurrent 887.5   887.5   884.6
Total liabilities $ 1,010.1   $ 1,010.1   $ 970.9