RETIREMENT-RELATED BENEFITS - Net Funded Status (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Net funded status recognized in the Consolidated Balance Sheet
Noncurrent assets - pension assets	$ 222.0	$ 148.0
Current liabilities - accrued compensation and benefits	(463.0)	(652.0)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations	(490.0)	(483.0)
Pension Plans
Net funded status recognized in the Consolidated Balance Sheet
Noncurrent assets - pension assets	222.0	148.0
Current liabilities - accrued compensation and benefits	(54.0)	(40.0)
Noncurrent liabilities - retirement and nonpension postretirement benefit obligations	(480.0)	(471.0)
Funded status, net	$ (311.0)	$ (364.0)

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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