Pension and Employee Benefit Plans, Defined Benefit Employee Benefit Plans (Details) - USD ($) $ in Millions |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Employer Contributions | ||||||||
| Net periodic benefit cost (income) | [1] | $ 3.5 | $ 4.6 | $ 3.3 | ||||
| U.S. Pension Plans | ||||||||
| Employer Contributions | ||||||||
| Employer contributions | 16.2 | 7.6 | ||||||
| Net periodic benefit cost (income) | 120.1 | 5.1 | 3.8 | |||||
| Settlements | (0.1) | [2] | (0.1) | (0.1) | ||||
| U.S. Pension Plans | U.S. Plans | ||||||||
| Employer Contributions | ||||||||
| Employer contributions | 14.9 | 6.5 | 0.9 | |||||
| U.S. Pension Plans | U.S. Plans | Plan | ||||||||
| Employer Contributions | ||||||||
| Settlements | 116.1 | |||||||
| U.S. Pension Plans | Non-U.S Plans | ||||||||
| Employer Contributions | ||||||||
| Employer contributions | 1.3 | 1.1 | 1.8 | |||||
| Postretirement Plans | ||||||||
| Employer Contributions | ||||||||
| Net periodic benefit cost (income) | $ (0.3) | $ (0.3) | $ (0.4) | |||||
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