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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Other Pension, Postretirement and Supplemental Plans      
Defined Benefit Plan Disclosure [Line Items]      
Employer matching contribution, percent of match (as a percent) 6.00%    
Employees’ capital accumulation plan, total expense recognized $ 218.4 $ 190.5 $ 176.8
Employees’ capital accumulation plan, company-paid contributions $ 213.3 $ 185.7 $ 171.6
Officer Medical Plan | Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average discount rate for benefit obligation (as a percent) 5.20% 4.90% 3.75%
Defined benefit plan, unfunded status of plan $ 127.0 $ 105.6