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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Deferred Compensation Liability [Abstract] |  |
Deferred compensation obligations | $ 3.2 | $ 3.0
Trading securities | 3.2 | 3.0
Assets Held For Sale [Abstract] |  |
Carrying value of assets held-for-sale | 8.5 | 3.2
U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 141.5 | 217.0
Money Market Investments [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 5.8 | 8.1
Common Stocks [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 25.0 | 42.7
Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 8.4 | 23.5
Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 56.0 | 80.4
Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 26.3 | 15.5
US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 18.4 | 39.8
Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 1.6 | 7.0
Level 1 [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 99.1 | 125.7
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 | 23.7 | 40.5
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 | 48.7 | 69.0
Level 1 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 26.3 | 15.5
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 | 0.4 | 0.7
Level 2 [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 42.4 | 91.3
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 5.8 | 8.1
Level 2 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 1.3 | 2.2
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 8.4 | 23.5
Level 2 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 7.3 | 11.4
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 | 18.4 | 39.8
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 1.2 | 6.3
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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