v3.26.1
Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Current:      
Current State and Local Tax Expense (Benefit) $ 38.1 $ 32.4 $ 26.2
Current Federal Tax Expense (Benefit) 17.6 12.9 7.6
Current Income Tax Expense (Benefit) 279.1 241.7 218.7
Deferred:      
Deferred State and Local Income Tax Expense (Benefit) 0.9 (5.0) (11.2)
Deferred Federal Income Tax Expense (Benefit) (0.2) (0.6) (0.9)
Increase (Decrease) in Deferred Income Taxes (16.9) (57.1) (69.1)
Income Tax Expense (Benefit) 262.2 184.7 149.5
UNITED STATES      
Current:      
Current Foreign Tax Expense (Benefit) 162.2 145.2 133.5
Deferred:      
Deferred Foreign Income Tax Expense (Benefit) (8.3) (43.1) (43.5)
Other locations      
Current:      
Current Foreign Tax Expense (Benefit) 61.2 51.3 51.3
Deferred:      
Deferred Foreign Income Tax Expense (Benefit) $ (9.3) $ (8.3) $ (13.5)