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Chapter 11 Proceedings and Ability to Continue as Going Concern - Debtor-in-Possession Condensed Combined Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Revenues      
Revenues, Total $ 1,427.2 $ 2,053.2 $ 1,705.4
OPERATING EXPENSES      
Contract drilling (exclusive of depreciation) 1,458.6 1,806.0 1,319.4
Asset Impairment Charges 3,646.2 104.0 40.3
Depreciation expense 540.8 609.7 478.9
General and administrative 214.6 188.9 102.7
Total operating expenses 5,860.2 2,708.6 1,941.3
Other Operating Income 118.1 0.0 0.0
EQUITY IN LOSSES OF ARO (7.8) (12.6) 0.0
OPERATING LOSS (4,322.7) (668.0) (235.9)
Other Income and Expenses [Abstract]      
Interest income 19.7 28.1 14.5
Reorganization Items (527.6) 0.0 0.0
Other, net 4.2 1,004.4 (34.8)
Other income (expense), net (794.3) 604.2 (303.0)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (5,117.0) (63.8) (538.9)
Total provision for income taxes (259.4) 128.4 89.6
NET LOSS (4,857.6) $ (192.2) $ (636.6)
Valaris, PLC And Certain Subsidiaries Party To The Bankruptcy Cases [Member]      
Operating Revenues      
Operating revenues 1,185.1    
Operating revenues from non-debtor subsidiaries 169.8    
Revenues, Total 1,354.9    
OPERATING EXPENSES      
Contract drilling (exclusive of depreciation) 1,203.0    
Asset Impairment Charges 3,643.9    
Depreciation expense 507.5    
General and administrative 213.6    
Operating expenses for non-debtor subsidiaries 169.1    
Total operating expenses 5,737.1    
Other Operating Income 118.1    
EQUITY IN LOSSES OF ARO (7.8)    
OPERATING LOSS (4,271.9)    
Other Income and Expenses [Abstract]      
Interest income 19.7    
Interest income for non-debtor subsidiaries 285.7    
Interest expense, net (290.8)    
Interest Expense for non-debtor subsidiaries (310.9)    
Reorganization Items (527.6)    
Other, net (6.7)    
Other income (expense), net (830.6)    
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (5,102.5)    
Equity In Loss Of Subsidiaries 11.4    
Total provision for income taxes (277.5)    
NET LOSS $ (4,813.6)