Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2010	Jul. 08, 2011 New Five Year Credit Agreement [Member]	Jul. 08, 2011 Existing Three Year Credit Agreement [Member]
Financial Instruments (Textuals) [Abstract]
Company's credit agreement		$ 1,050.0	$ 500.0
Financial Instruments (Additional) [Abstract]
Repurchased of 7.45% debentures	84.9
Debt instrument, interest rate	7.45%
Cost of call warrants having rights to call included in other current assets	8.9
Notional amount of additional call warrants recorded in other current assets	51.6
Increment in the fair value of the call warrants	$ 3.2

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant