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Rowan Transaction (Narrative) (Details)
$ / shares in Units, € in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 11, 2019
USD ($)
$ / shares
Apr. 11, 2019
EUR (€)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 23, 2018
$ / shares
Business Acquisition [Line Items]                        
Business Combination, Bargain Purchase, Adjustment     $ 0.0     $ 53.0 $ 6.3   $ (659.8)      
Tax Assessment         $ 42.0              
Deferred Tax Liabilities, Net     37.3   $ 99.0   37.3          
OPERATING REVENUES     285.3     551.3 1,130.7   1,541.1      
NET LOSS ATTRIBUTABLE TO VALARIS     (670.9)     (197.1) (4,784.6)   18.0      
Rowan Companies [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 16.2   3.1       3.1          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 2.1   0.7       0.7          
Impairment of Intangible Assets, Finite-lived             $ 5.7          
Finite-Lived Intangible Assets, Remaining Amortization Period             1 year 3 months 18 days 1 year 3 months 18 days        
Amortization of intangible assets     0.5       $ 2.4          
Unrecognized Tax Benefits, Increase Resulting from Acquisition $ 50.4                      
Business Combination, Acquisition Related Costs           0.2     18.0      
OPERATING REVENUES           138.9     286.2      
NET LOSS ATTRIBUTABLE TO VALARIS           31.2     95.1      
Business Combination, Integration Related Costs           $ 16.0     $ 85.4      
Rowan Companies [Member] | Class A ordinary shares, U.S.                        
Business Acquisition [Line Items]                        
Shares Issued, Price Per Share | $ / shares $ 15.88                      
Share Price | $ / shares                       $ 33.92
Forecast | Rowan Companies [Member]                        
Business Acquisition [Line Items]                        
Capitalized Contract Cost, Amortization                   $ 2.0 $ 0.4  
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]                        
Business Acquisition [Line Items]                        
Unrecognized tax benefit, maximum exposure       € 142.0     166.5 € 142.0        
Tax Assessment | €   € 93.0                    
Deferred Tax Liabilities, Net     $ 109.0       $ 109.0