Pension And Other Postretirement Benefit Plans Pension and Other Postretirement Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Sep. 30, 2012
Pension and Other Postretirement Benefits [Line Items]
Contributions to qualified and non-qualified pension plans	$ 5.6
Expected additional contributions in the current fiscal year	11.1
ERISA-regulated U.S. plan [Member]
Pension and Other Postretirement Benefits [Line Items]
Expected additional contributions in the current fiscal year	5.5
Non-ERISA regulated and Other Plans [Member]
Pension and Other Postretirement Benefits [Line Items]
Expected additional contributions in the current fiscal year	$ 5.6

The increase in the fair value of plan assets from contributions made by the employer.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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)(3)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration