Consolidated Balance Sheets (Parenthetical) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015 USD ($)	Mar. 31, 2015 EUR (€)	Mar. 31, 2014 USD ($)	Mar. 31, 2014 EUR (€)
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, net	$ 0.8		$ 1.0
Common stock, par value		€ 0.59		€ 0.59
Common stock, shares authorised	2,000,000,000us-gaap_CommonStockSharesAuthorized	2,000,000,000us-gaap_CommonStockSharesAuthorized	2,000,000,000us-gaap_CommonStockSharesAuthorized	2,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	445,680,673us-gaap_CommonStockSharesIssued	445,680,673us-gaap_CommonStockSharesIssued	445,033,502us-gaap_CommonStockSharesIssued	445,033,502us-gaap_CommonStockSharesIssued

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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