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Income Taxes (Narrative) (Details)
€ in Millions, RM in Millions, $ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2024
USD ($)
Feb. 29, 2024
MYR (RM)
Feb. 29, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
MYR (RM)
Mar. 31, 2023
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
AUD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2021
USD ($)
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Income from continuing operations before income taxes in the U.S. countries                     $ 49.8   $ 30.7 $ 39.7        
Income from continuing operations before income taxes in the non-U.S. countries                     (320.4)   (53.5) (185.2)        
Deferred tax assets related to net operating loss carryforwards       $ 3,071.8             3,071.8   3,308.9          
Net operating loss carryforwards       13,500.0             13,500.0              
Operating Loss Carryforwards, Limitations on Use       126.0             126.0              
Operating loss carryforwards, Not subject to expiration       13,100.0             13,100.0              
Operating loss carryforwards, Subject to expiration       400.0             400.0              
Income Tax Expense (Benefit), Discrete Item                     $ 85.8   $ 42.0 $ 10.3        
Consilidated effective income tax rate excluding discrete items                     21.80% 21.80% (872.30%) 73.60%        
Total unrecognized tax benefits       93.5             $ 93.5   $ 201.4 $ 217.6       $ 235.1
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized       82.8             82.8              
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations       2.7             2.7   77.3 4.5        
Deferred Tax Assets, Gross       856.8             856.8   881.7          
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions                     1.4   3.4 1.0        
Income Tax Examination, Increase (Decrease) in Liability from Prior Year                           17.2        
Deferred Income Taxes and Tax Credits             RM 799.5       8.5   802.9 1.5        
Interest limitation carryforwards       126.0             126.0   123.4          
Total provision for income taxes                     0.4   (782.6) 43.1        
Deferred Tax Assets, Valuation Allowance       3,971.3             3,971.3   4,192.4          
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued       128.3             128.3   224.0          
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                     8.0   35.4 12.5        
Undistributed Earnings of Foreign Subsidiaries       271.9             271.9              
Amount of accrued interest and penalties included in other liabilities       45.5             45.5   52.3          
Proceeds from Income Tax Refunds               $ 45.9     35.9 $ 38.0            
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities                     103.5   41.8 $ 16.5        
Proceeds from Income Tax Refunds               $ 45.9     35.9 $ 38.0            
Luxembourg subsidiaries                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Total provision for income taxes       (65.0)   $ 65.0                        
Rowan Companies [Member] | LUXEMBOURG                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Net operating loss carryforwards       2,200.0             2,200.0              
Rowan Companies [Member] | United States [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Net operating loss carryforwards       612.4             612.4              
Rowan Companies [Member] | SWITZERLAND                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Net operating loss carryforwards       39.8             39.8              
Rowan Companies [Member] | United Kingdom [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Net operating loss carryforwards       78.0             78.0              
Rowan Companies [Member] | BERMUDA                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Net operating loss carryforwards       42.6             $ 42.6              
Maximum                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Operating loss carryforwards tax credits expiration year                     2034 2034            
Interest limitation carryforwards       0.5             $ 0.5              
Minimum                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Operating loss carryforwards tax credits expiration year                     2025 2025            
Other Liabilities [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Total unrecognized tax benefits       82.8             $ 82.8   171.7          
Other Current Assets [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Total unrecognized tax benefits       10.7             10.7   29.7          
Australian Taxation Office [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Proceeds from Income Tax Refunds                     24.0              
Income Tax Examination, Penalties and Interest Expense                             $ 63.0 $ 101.0    
Amount agreed with Australia tax authorities for tax assessment       2.0             2.0           $ 4.0  
Payments for Other Taxes                 $ 29.0 $ 42.0                
Proceeds from Income Tax Refunds                     24.0              
Australian Taxation Office [Member] | Rowan Companies [Member]                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities       18.0                            
Luxembourg Taxation Office                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Income Tax Credits and Adjustments | €     € 60.0                              
BERMUDA                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Deferred Tax Assets, Valuation Allowance                         27.5          
Deferred Tax Assets, Deferred Income                         27.5          
Deferred Tax Assets, Deferred Income                         $ 27.5          
MALAYSIA                                    
Investments, Owned, Federal Income Tax Note [Line Items]                                    
Income Tax Examination, Penalties and Interest Expense $ 26.0 RM 117.0                                
Payments for Other Taxes         $ 18.0                          
Accrual for Taxes Other than Income Taxes       $ 8.0             $ 8.0