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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Bermuda federal statutory rate $ 82.8    
Changes in valuation allowances 16.1    
Expiration of foreign tax credits 16.3    
Changes in unrecognized tax benefits (3.7)    
Total provision for income taxes $ (426.8) $ 0.4 $ (782.6)
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Bermuda federal statutory rate 15.00% 0.00% 0.00%
Changes in valuation allowances 2.90% (2.30%) (953.60%)
Prior period tax matters   (23.20%) (49.90%)
Changes in unrecognized tax benefits (0.60%)    
Non-Bermuda taxes   25.60% 74.00%
Effective income tax rate (77.30%) 0.10% (929.50%)
Angola      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ (8.0)    
Withholding taxes 16.5    
Other $ 8.4    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances (1.40%)    
Withholding taxes 3.00%    
Other 1.50%    
Brazil      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Tax rate differential $ 11.5    
Other $ (3.1)    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax rate differential 2.10%    
Other (0.60%)    
British Virgin Islands      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Tax rate differential $ 6.3    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax rate differential 1.10%    
Luxembourg      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ (1,092.2)    
Prior period tax matters (54.8)    
State and local tax rate differential 9.2    
Cross border income inclusion 9.5    
Other $ 4.8    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances (197.80%)    
Prior period tax matters (9.90%)    
State and local tax rate differential 1.70%    
Cross border income inclusion 1.70%    
Other 0.90%    
Saudi Arabia      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Withholding taxes $ 6.3    
Other $ 2.8    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Withholding taxes 1.10%    
Other 0.50%    
Switzerland      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ 383.9    
Prior period tax matters 156.2    
State and local tax rate differential 13.4    
Global minimum taxes 5.5    
Tax rate differential (25.2)    
Other $ (1.4)    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances 69.50%    
Prior period tax matters 28.30%    
State and local tax rate differential 2.40%    
Global minimum taxes 1.00%    
Tax rate differential (4.60%)    
Other (0.30%)    
Trinidad      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ (5.2)    
Tax rate differential 6.6    
Other $ (1.5)    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances (0.90%)    
Tax rate differential 1.20%    
Other (0.30%)    
United Kingdom      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ 10.0    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances 1.80%    
U.S.      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Changes in valuation allowances $ (17.2)    
Other $ 6.6    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Changes in valuation allowances (3.10%)    
Expiration of foreign tax credits 3.00%    
Other 1.20%    
Other foreign      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Other $ 12.8    
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Other 2.30%