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Income Taxes - Reconciliation of Income Tax Provisions - Current Year (Details) - USD ($)
$ in Millions
 12 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 29, 2024
Amount      
Income tax provision (benefit) at statutory rate $ 499.3 $ (17.4) $ 466.6
State and local income taxes, net of federal income tax provision (benefit)   (31.2) 35.9
Changes in valuation allowances   24.1 86.2
Other   (3.9) (7.4)
Interest limitation (353.6)    
Global intangible low-taxed income 187.8    
Other 53.9    
Net income tax provision (benefit) for various U.S. income tax credits (3.4) (14.1) 0.0
Tax contingencies (245.4)    
Income tax provision (benefit) $ 621.0 $ (51.7) $ 456.6
% of Pretax Income (Loss)      
Income tax provision (benefit) at statutory rate 21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax provision (benefit)   37.70% 1.60%
Changes in valuation allowances   (29.10%) 3.90%
Other   4.70% (0.30%)
Interest limitation (14.90%)    
Global intangible low-taxed income 7.90%    
Other 2.30%    
Net income tax provision (benefit) for various U.S. income tax credits (0.10%) 17.00% 0.00%
Tax contingencies (10.30%)    
Income tax provision (benefit) at effective rate 26.10% 62.40% 20.60%
SWITZERLAND      
Amount      
State and local income taxes, net of federal income tax provision (benefit) $ 81.0    
Statutory income tax difference (62.5)    
Changes in valuation allowances 184.7    
Other $ (14.0)    
% of Pretax Income (Loss)      
State and local income taxes, net of federal income tax provision (benefit) 3.40%    
Statutory income tax difference (2.60%)    
Changes in valuation allowances 7.80%    
Other (0.60%)    
MALTA      
Amount      
Statutory income tax difference $ 121.6    
Changes in valuation allowances 353.6    
Nontaxable or nondeductible items, net $ (297.2)    
% of Pretax Income (Loss)      
Statutory income tax difference 5.10%    
Changes in valuation allowances 14.90%    
Nontaxable or nondeductible items, net (12.50%)    
Other foreign jurisdictions      
Amount      
Other $ (21.3)    
% of Pretax Income (Loss)      
Other (0.90%)    
UNITED STATES      
Amount      
State and local income taxes, net of federal income tax provision (benefit) $ 24.9    
Changes in valuation allowances 51.0    
Nontaxable or nondeductible items, net $ 60.6    
% of Pretax Income (Loss)      
State and local income taxes, net of federal income tax provision (benefit) 1.00%    
Changes in valuation allowances 2.10%    
Nontaxable or nondeductible items, net 2.50%