Litigation (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014 item
Litigation
Alleged tax deficiency including interest and penalties related to 2006 through 2008 tax years	$ 13.3
Number of subsidiaries to which alleged tax deficiencies are related	2
Liability or reserve recorded related to alleged tax deficiencies	$ 0

Estimated amount of loss resulting from an adverse tax position.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)(3)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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