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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Apr. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
jackup
floater
rigs
country
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | rigs           52    
Number of different countries having drilling contracts spanning | country           6    
Net foreign currency exchange gains (losses)       $ 13.4 $ 8.1 $ 12.2   $ (11.0)
Asset Impairment Charges $ 34.5 $ 34.5 $ 5.6 $ 756.5 $ 0.0 $ 34.5   $ 3,646.2
Antidilutive share options excluded from computation of diluted earnings per share | shares       300,000 600,000 192,000   400,000
Class of Warrant or Right, Outstanding | shares       5,600,000   5,470,970    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 131.88        
Warranted, Period Exercisable           7 years    
Common Stock, Par or Stated Value Per Share | $ / shares       $ 14.39 $ 0.01 $ 0.01 $ 0.01  
Total provision for income taxes       $ (16.2) $ (36.4) $ (43.1)   $ 259.4
Contract Drilling       (343.8) (724.1) (1,383.2)   (1,470.4)
Unrecognized Tax Benefits, Period Increase (Decrease)               122.1
OTHER ASSETS       (165.3) (169.9) (171.8) $ (169.9)  
Other Liabilities, Noncurrent       (565.4) (558.4) (515.6) (558.4)  
Retained Earnings (Accumulated Deficit)       0.0 16.4 $ (160.1) 16.4  
Restatement Adjustment [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Total provision for income taxes         1.0   10.7  
Deferred Tax Assets, Tax Deferred Expense         6.1   6.1  
Contract Drilling         4.6      
Carryback Provision for Income Taxes               1.3
OTHER ASSETS         6.1   6.1  
Other Liabilities, Noncurrent         22.7   22.7  
Retained Earnings (Accumulated Deficit)         $ 11.0   $ 11.0  
Drilling rigs and equipment [Member] | Minimum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           5 years    
Drilling rigs and equipment [Member] | Maximum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           35 years    
Building and Building Improvements [Member] | Minimum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           10 years    
Building and Building Improvements [Member] | Maximum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           30 years    
Equipment [Member] | Minimum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           2 years    
Equipment [Member] | Maximum                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Property, Plant and Equipment, Useful Life           6 years    
Other Rigs [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Asset Impairment Charges       $ 756.5   $ 34.5   $ 3,600.0
Floaters [Member] | Ultra Deepwater Drillships [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | floater           11    
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | floater           4    
Floaters [Member] | Moored Semisubmersible Rigs [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | floater           1    
Jackups [Member]                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | jackup           36    
ARO                
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]                
Number of contract drilling rigs | floater           7