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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Employer matching contribution, percentage of match	6.00%
Employees’ capital accumulation plan, total expense recognized	$ 190.5	$ 176.8	$ 166.3
Employees’ capital accumulation plan, company-paid contributions	$ 185.7	$ 171.6	$ 163.0
Officer Medical Plan | Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate for benefit obligation (as a percent)	4.90%	3.75%	3.40%
Unfunded status of plan	$ 105.6	$ 113.5

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 715
-SubTopic 20
-Section 45
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-URI https://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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