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Income Taxes (Narrative) (Details)
€ in Millions, RM in Millions, R$ in Millions, $ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Feb. 29, 2024
USD ($)
Feb. 29, 2024
MYR (RM)
Jul. 31, 2023
BRL (R$)
Mar. 31, 2025
USD ($)
Mar. 31, 2025
AUD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
MYR (RM)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
AUD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
MYR (RM)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
AUD ($)
Dec. 31, 2022
USD ($)
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Income from continuing operations before income taxes, domestic                     $ (107.4)   $ 49.8 $ 30.7          
Income from continuing operations before income taxes, foreign                     (659.7)   (320.4) (53.5)          
Deferred tax assets related to net operating loss carryforwards           $ 3,071.8         3,103.9   3,071.8     $ 3,103.9      
Net operating loss carryforwards                     13,600.0         13,600.0      
Operating Loss Carryforwards, Limitations on Use                     112.9         112.9      
Operating loss carryforwards, Not subject to expiration                     8,400.0         8,400.0      
Operating loss carryforwards, Subject to expiration                     5,200.0         5,200.0      
Income Tax Expense (Benefit), Discrete Item                     $ 153.7   $ 85.8 $ 42.0          
Consilidated effective income tax rate excluding discrete items                     (92.20%) (92.20%) 21.80% (872.30%)          
Total unrecognized tax benefits           93.5         $ 94.8   $ 93.5 $ 201.4   94.8     $ 217.6
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized                     88.2         88.2      
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations           2.7         1.4   2.7 77.3   1.4      
Deferred Tax Assets, Gross           856.8         1,368.0   856.8     1,368.0      
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions                     8.6   1.4 3.4          
Deferred Income Taxes and Tax Credits               RM 799.5     523.2   8.5 802.9          
Interest limitation carryforwards           126.0         112.9   126.0     112.9      
Total provision for income taxes                     (426.8)   0.4 (782.6)          
Deferred Tax Assets, Valuation Allowance           3,971.3         3,292.3   3,971.3     3,292.3      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued           128.3         136.2   128.3     136.2      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                     1.5   8.0 35.4          
Amount of accrued interest and penalties included in other liabilities           45.5         48.0   45.5     48.0      
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities           18.0         7.0   103.5 41.8          
Amount agreed with Australia tax authorities for tax assessment                                   $ 4.0  
Loss Contingency, Damages Sought, Value | R$     R$ 601.0                                
Loss Contingency, Damages Sought, Value | R$     R$ 601.0                                
Deferred income tax expense (benefit), foreign       $ 168.8             (515.1)   10.2 (788.3)          
Luxembourg subsidiaries                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Total provision for income taxes             $ (65.0)                        
Liability for Uncertainty in Income Taxes, Noncurrent           65.0             65.0       € 60.0    
Liability for Uncertainty in Income Taxes, Noncurrent           65.0             65.0       € 60.0    
Luxembourg                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Deferred Income Taxes and Tax Credits | RM                       RM 1,100.0              
Switzerland                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Deferred Income Taxes and Tax Credits | RM                       RM 383.9              
Rowan Companies [Member] | Luxembourg                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     2,300.0         2,300.0      
Rowan Companies [Member] | U.S.                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     614.9         614.9      
Rowan Companies [Member] | Switzerland                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     27.2         27.2      
Rowan Companies [Member] | United Kingdom                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     75.7         75.7      
Rowan Companies [Member] | Bermuda                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     58.7         58.7      
Rowan Companies [Member] | Trinidad                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Net operating loss carryforwards                     $ 21.2         21.2      
Maximum                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Operating loss carryforwards tax credits expiration year                     2042 2042              
Interest limitation carryforwards                     $ 0.5         0.5      
Other Liabilities [Member]                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Total unrecognized tax benefits           82.8         88.2   82.8     88.2      
Other Noncurrent Assets                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Total unrecognized tax benefits           10.7         6.6   10.7     6.6      
Australian Taxation Office                                      
Investments, Owned, Federal Income Tax Note [Line Items]                                      
Amount agreed with Australia tax authorities for tax assessment           $ 2.0             2.0            
Payments for Other Taxes                 $ 29.0 $ 42.0                  
Loss Contingency, Damages Sought, Value                             $ 101.0        
Proceeds from Income Tax Refund, Foreign       26.0 $ 42.0                            
Loss Contingency, Damages Sought, Value                             $ 101.0        
Proceeds from Income Tax Refund, Foreign       $ 26.0 $ 42.0                            
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 $ 29.0 RM 117.0                                  
Payments for Other Taxes                     $ 8.0   $ 18.0     $ 26.0