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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | ---
Deferred Compensation Liability [Abstract] |  |  |
Deferred compensation obligations | $ 6.0 | $ 5.8 |
Trading securities | 6.0 | 5.8 |
U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 155.1 | 157.7 | $ 148.2
U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 54.3 | 142.9 |
U.S. Pension Plans [Member] | Investments Measured at Net Asset Value [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 100.8 | 14.8 |
Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 3.9 | 11.4 |
Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 12.0 |
Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 9.4 | 9.7 |
Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 27.7 | 64.4 |
Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 27.3 |
US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 12.3 | 16.2 |
Other [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 1.0 | 1.9 |
Level 1 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 27.8 | 101.3 |
Level 1 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 9.4 |
Level 1 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 27.7 | 64.4 |
Level 1 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 27.3 |
Level 1 [Member] | US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.1 | 0.2 |
Level 2 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investments Measured at Net Asset Value [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 26.5 | 41.6 |
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 3.9 | 11.4 |
Level 2 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 2.6 |
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 9.4 | 9.7 |
Level 2 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 2 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 0.0 |
Level 2 [Member] | US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 12.3 | 16.2 |
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | 0.9 | 1.7 |
Level 3 [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |

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