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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
--- | --- | ---
Assets Held For Sale [Abstract] |  |
Carrying value of assets held-for-sale | $ 11.6 | $ 11.4
U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 213.7 | 200.6
Money Market Investments [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 11.3 | 7.3
Common Stock [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 42.2 | 36.0
Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 21.3 | 19.1
Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 80.8 | 82.9
Pooled Fixed Income Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 14.1 | 17.6
US Government and Agency Securities [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 37.0 | 32.1
Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 7.0 | 5.6
Level 1 [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 124.7 | 123.3
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
Level 1 [Member] | Common Stock [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 40.1 | 35.9
Level 1 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 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 | 68.9 | 68.8
Level 1 [Member] | Pooled Fixed Income Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 14.1 | 17.6
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
Level 1 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 1.6 | 1.0
Level 2 [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 89.0 | 77.3
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 11.3 | 7.3
Level 2 [Member] | Common Stock [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 2.1 | 0.1
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 21.3 | 19.1
Level 2 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 11.9 | 14.1
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 | 37.0 | 32.1
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 5.4 | 4.6
Level 3 [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Level 3 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Level 3 [Member] | Common Stock [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Level 3 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Level 3 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Level 3 [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 3 [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
Level 3 [Member] | Other [Member] | U.S. Pension Plans [Member] |  |
U.S. pension plan assets [Abstract] |  |
Fair value of plan assets | 0 | 0
Fair Value, Measurements, Recurring [Member] |  |
Assets [Abstract] |  |
Trading securities | 2.6 | 2.3
Total assets | 2.6 | 2.3
Liabilities [Abstract] |  |
Derivative financial instruments | 0.4 | 1.4
Deferred compensation obligations | 2.6 | 2.3
Total liabilities | 3.0 | 3.7
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets [Abstract] |  |
Trading securities | 2.6 | 2.3
Total assets | 2.6 | 2.3
Liabilities [Abstract] |  |
Derivative financial instruments | 0 | 0
Deferred compensation obligations | 2.6 | 2.3
Total liabilities | 2.6 | 2.3
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets [Abstract] |  |
Trading securities | 0 | 0
Total assets | 0 | 0
Liabilities [Abstract] |  |
Derivative financial instruments | 0.4 | 1.4
Deferred compensation obligations | 0 | 0
Total liabilities | 0.4 | 1.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets [Abstract] |  |
Trading securities | 0 | 0
Total assets | 0 | 0
Liabilities [Abstract] |  |
Derivative financial instruments | 0 | 0
Deferred compensation obligations | 0 | 0
Total liabilities | $ 0 | $ 0

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: 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=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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