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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | ---
Deferred Compensation Liability [Abstract] |  |  |  |
Deferred compensation obligations |  | $ 5.8 | $ 5.0 |
Trading securities |  | 5.8 | 5.0 |
U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 157.7 | 148.2 | $ 141.5
U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 142.9 | 139.5 |
U.S. Pension Plans [Member] | Investment Measured at Net Asset Value [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets | [1] | 14.8 | 8.7 |
Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 11.4 | 5.6 |
Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 12.0 | 19.8 |
Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 9.7 | 9.3 |
Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 64.4 | 56.8 |
Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 27.3 | 26.5 |
US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 16.2 | 18.7 |
Other [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 1.9 | 2.8 |
Level 1 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 101.3 | 102.5 |
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 | 17.8 |
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 |  | 64.4 | 56.8 |
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 | 26.5 |
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 |  | 0.2 | 1.4 |
Level 2 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 41.6 | 37.0 |
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 11.4 | 5.6 |
Level 2 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 2.6 | 2.0 |
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 9.7 | 9.3 |
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 | 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 |  | 16.2 | 18.7 |
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | 1.7 | 1.4 |
Level 3 [Member] | U.S. Pension Plans [Member] |  |  |  |
U.S. pension plan assets [Abstract] |  |  |  |
Fair value of plan assets |  | $ 0.0 | $ 0.0 |
[1] | As a practical expedient, the Company valued a collective trust fund using its net asset value per unit, and therefore, has not classified this investment within the fair value hierarchy.

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