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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | ---
Deferred Compensation Liability [Abstract] |  |  |
Deferred compensation obligations |  | $ 5.0 | $ 3.2
Trading securities |  | 5.0 | 3.2
U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | [1] | 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 |  | 139.5 | 134.2
U.S. Pension Plans [Member] | Investment Measured at Net Asset Value [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets | [1] | 8.7 | 7.3
Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 5.6 | 5.8
Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 19.8 | 25.0
Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 9.3 | 8.4
Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 56.8 | 48.7
Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 26.5 | 26.3
US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 18.7 | 18.4
Other [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 2.8 | 1.6
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 |  | 102.5 | 99.1
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 |  | 17.8 | 23.7
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 |  | 56.8 | 48.7
Level 1 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 26.5 | 26.3
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 |  | 1.4 | 0.4
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 |  | 37.0 | 35.1
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 5.6 | 5.8
Level 2 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 2.0 | 1.3
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 9.3 | 8.4
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 |  | 18.7 | 18.4
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |  |
U.S. pension plan assets [Abstract] |  |  |
Fair value of plan assets |  | 1.4 | 1.2
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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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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