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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Debtor-in-Possession Condensed Combined Statement of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]    
OPERATING REVENUES $ 307.1 $ 456.6
OPERATING EXPENSES    
Contract drilling (exclusive of depreciation) 252.2 476.0
Loss on impairment 756.5 2,808.2
Depreciation expense 122.1 164.5
General and administrative 24.3 53.4
Total operating expenses 1,155.1 3,502.1
EQUITY IN EARNINGS OF ARO 1.9 (6.3)
OPERATING LOSS (846.1) (3,051.8)
OTHER INCOME (EXPENSE)    
Interest income 2.6 4.8
Interest expense, net 1.3 113.2
Reorganization items, net 52.2 0.0
Other, net 21.1 0.5
OTHER INCOME (EXPENSE), NET (29.8) (107.9)
LOSS BEFORE INCOME TAXES (875.9) (3,159.7)
INCOME TAX PROVISION 31.7 (152.0)
Net loss (907.6) $ (3,007.7)
Valaris, PLC And Certain Subsidiaries Party To The Bankruptcy Cases    
Restructuring Cost and Reserve [Line Items]    
Operating revenues 250.1  
Total revenue from ARO 20.6  
OPERATING REVENUES 270.7  
OPERATING EXPENSES    
Contract drilling (exclusive of depreciation) 207.7  
Loss on impairment 756.5  
Depreciation expense 113.9  
General and administrative 24.2  
Operating expense for non-debtor subsidiaries 17.7  
Total operating expenses 1,120.0  
EQUITY IN EARNINGS OF ARO 1.9  
OPERATING LOSS (847.4)  
OTHER INCOME (EXPENSE)    
Interest income 2.6  
Interest Income for non-debtor subsidiaries 58.6  
Interest expense, net 1.3  
Interest expense for non-debtor subsidiaries 66.4  
Reorganization items, net 52.2  
Other, net 18.9  
OTHER INCOME (EXPENSE), NET (39.8)  
LOSS BEFORE INCOME TAXES (887.2)  
EQUITY IN LOSSES OF SUBSIDIARIES (12.5)  
INCOME TAX PROVISION 15.0  
Net loss $ (914.7)