Lines of Credit and Financing Arrangements (Details Textual 3) (Senior Notes [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2013	Dec. 31, 2012	May 31, 2010
Senior Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes	$ 200.0	$ 200.0	$ 200.0
Fixed interest rate for senior unsecured notes	4.90%
Maturity date of senior unsecured notes	May 15, 2017
Minimum principal amount accelerated	$ 75
Notice Date	30 days

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

Name:	us-gaap_UnsecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant