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Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Fair Value Measurements [Abstract] |  |  |
Investments | $ 2.8 | $ 3.8 |
Deferred compensation obligations | 2.8 | 3.8 |
Decrease in fair value of investments | $ (1.0) |  |
Notice period for redeeming real estate investment funds | 90 days |  |
Notice period for redeeming fixed income investment funds | 60 days |  |
U.S. Pension Plans [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | $ 183.3 | 131.1 | $ 155.1
U.S. Pension Plans [Member] | Money Market Investments [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 2.5 | 2.4 |
U.S. Pension Plans [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 8.9 | 8.7 |
U.S. Pension Plans [Member] | Pooled Equity Funds [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 37.3 | 17.9 |
U.S. Pension Plans [Member] | U.S. Government and Agency Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 14.5 | 13.1 |
U.S. Pension Plans [Member] | Other [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 1.1 | 0.8 |
U.S. Pension Plans [Member] | Total [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 64.3 | 42.9 |
U.S. Pension Plans [Member] | Level 1 [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 37.4 | 18.0 |
U.S. Pension Plans [Member] | Level 1 [Member] | Money Market Investments [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Pension Plans [Member] | Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Pension Plans [Member] | Level 1 [Member] | Pooled Equity Funds [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 37.3 | 17.9 |
U.S. Pension Plans [Member] | Level 1 [Member] | U.S. Government and Agency Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Pension Plans [Member] | Level 1 [Member] | Other [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.1 | 0.1 |
U.S. Pension Plans [Member] | Level 2 [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 26.9 | 24.9 |
U.S. Pension Plans [Member] | Level 2 [Member] | Money Market Investments [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 2.5 | 2.4 |
U.S. Pension Plans [Member] | Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 8.9 | 8.7 |
U.S. Pension Plans [Member] | Level 2 [Member] | Pooled Equity Funds [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Pension Plans [Member] | Level 2 [Member] | U.S. Government and Agency Securities [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 14.5 | 13.1 |
U.S. Pension Plans [Member] | Level 2 [Member] | Other [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 1.0 | 0.7 |
U.S. Pension Plans [Member] | Level 3 [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Pension Plans [Member] | Net Asset Value [Member] |  |  |
Fair Value Measurements [Abstract] |  |  |
Fair value of plan assets | $ 119.0 | $ 88.2 |

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