Business Combinations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 item	Dec. 31, 2012 item
Business Combinations
Revenue from acquisition in 2013	$ 229.1
Pre-tax income from acquisition in 2013	$ 9.7
Business combinations
Number of acquired franchises	9
Hertz car rental franchise
Business combinations
Number of acquired franchises	1
Automotive retail franchise
Business combinations
Number of acquired franchises	9	26

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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