v3.26.1
Income Taxes - Effective Income Tax Rate Reconciliation: ASU 2023-09 (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Amount      
Tax at national statutory rate $ 130.9    
National nontaxable, nondeductible items (0.1)    
National cross-border laws 7.3    
National other 3.1    
Other 0.6    
Global changes in uncertain tax positions (1.6)    
Total Provision for Income Taxes $ 262.2 $ 184.7 $ 149.5
Percentage      
Tax at national statutory rate 12.50% 12.50% 12.50%
National nontaxable, nondeductible items 0.00%    
National cross-border laws 0.70%    
National other 0.30%    
Statutory rate differential   9.90% 8.50%
State and local taxes, net   2.80% 2.20%
Other 0.20% 0.10% (0.10%)
Global changes in uncertain tax positions (0.20%)    
Total Provision for Income Taxes 25.00% 23.20% 21.30%
UNITED STATES      
Amount      
Statutory rate differential $ 62.9    
Federal credits (6.1)    
State and local taxes, net 30.8    
Equity based compensation (7.0)    
Withholding taxes 19.8    
Foreign-derived deduction eligible income (8.5)    
Other $ 10.9    
Percentage      
Statutory rate differential 6.00%    
Federal credits (0.60%)    
State and local taxes, net 2.90%    
Equity based compensation (0.70%)    
Withholding taxes 1.90%    
Foreign-derived deduction eligible income (0.80%)    
Other 1.00%    
UNITED KINGDOM      
Amount      
Statutory rate differential $ 6.8    
Other $ 0.3    
Percentage      
Statutory rate differential 0.60%    
Other 0.00%    
Other locations operations      
Amount      
Statutory rate differential $ 12.2    
Percentage      
Statutory rate differential 1.20%