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- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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No definition available.

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Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

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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.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis.

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Assets Held For Sale [Abstract]
Asset impairment charges	$ 25.9	$ 2.5	$ 3.5
Carrying value of assets held-for-sale	11.4	2.5
U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	200.6	186.6
Money Market Investments [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	7.3	11.7
Common Stock [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	36.0	26.8
Corporate Bonds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	19.1	18.2
Pooled Equity Funds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	82.9	79.6
Pooled Fixed Income Funds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	17.6	16.2
US Government and Agency Securities [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	32.1	29.3
Other [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	5.6	4.8
Level 1 [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	123.3	111.6
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	35.9	26.7
Level 1 [Member] \| Corporate Bonds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	0	0
Level 1 [Member] \| Pooled Equity Funds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	68.8	67.5
Level 1 [Member] \| Pooled Fixed Income Funds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	17.6	16.2
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	1.0	1.2
Level 2 [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	77.3	75.0
Level 2 [Member] \| Money Market Investments [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	7.3	11.7
Level 2 [Member] \| Common Stock [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	0.1	0.1
Level 2 [Member] \| Corporate Bonds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	19.1	18.2
Level 2 [Member] \| Pooled Equity Funds [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	14.1	12.1
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	32.1	29.3
Level 2 [Member] \| Other [Member] \| U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	4.6	3.6
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	2.3	1.8
Derivative financial instruments		0.4
Total assets	2.3	2.2
Liabilities [Abstract]
Derivative financial instruments	1.4	3.5
Deferred compensation obligations	2.3	1.8
Total liabilities	3.7	5.3
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Trading securities	2.3	1.8
Derivative financial instruments		0
Total assets	2.3	1.8
Liabilities [Abstract]
Derivative financial instruments	0	0
Deferred compensation obligations	2.3	1.8
Total liabilities	2.3	1.8
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets [Abstract]
Trading securities	0	0
Derivative financial instruments		0.4
Total assets	0	0.4
Liabilities [Abstract]
Derivative financial instruments	1.4	3.5
Deferred compensation obligations	0	0
Total liabilities	1.4	3.5
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Trading securities	0	0
Derivative financial instruments		0
Total assets	0	0
Liabilities [Abstract]
Derivative financial instruments	0	0
Deferred compensation obligations	0	0
Total liabilities	$ 0	$ 0