The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44D

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

Fair Value Measurements and Derivative Instruments (Details 12) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 Standard & Poor's, BBB- Rating Lower Limit	Jun. 30, 2013 Moody's, Baa3 Rating	Jun. 30, 2013 Standard & Poor's, BB Rating	Jun. 30, 2013 Moody's, Ba1 Rating	Jun. 30, 2013 Maturity of at least five years Lower Limit	Jun. 30, 2013 Interest rate contracts item	Dec. 31, 2012 Interest rate contracts
Derivative instruments disclosure
Credit ratings for senior debt	BBB-	Baa3	BB	Ba1
Number of derivative instruments						5
Interest rate instrument term					5 years
Aggregate fair value of all derivative instruments with credit-related contingent features in net liability positions						$ 61.4	$ 55.5