The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

Long-Term Debt And Liquidity Long-Term Debt And Liquidity (Senior Notes) (Details) (Senior Notes [Member], USD $) In Millions, unless otherwise specified	Nov. 20, 2012	Nov. 20, 2012 Maximum [Member]	Dec. 31, 2013 Minimum [Member]
Debt Instrument [Line Items]
Principal amount issued	$ 300
Stated interest rate	6.375%
Redemption price percentage of principal prior to November 15, 2016	100.00%
Redemption percentage price of aggregate principal prior to November 15, 2015		35.00%
Redemption price percentage of principal prior to November 15, 2015	106.375%
Repurchase percentage price of aggregate principal due to change in control	101.00%
Unpaid indebtness after maturity or acceleration			50.0
Unpaid judgment or decree			$ 50.0