Goodwill and Other Intangible Assets (Change in Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill
Balance at the beginning of the period	$ 2,050.3		$ 1,113.1
Accumulated impairment losses at the beginning of the period	(721.0)		(721.0)
Net goodwill, balance at the beginning of the period	1,329.3		392.1
Goodwill acquired during the period	4.0		954.3
Adjustments to previously recorded purchase price allocation	13.2	[1]	(15.3)	[2]
Other changes during the period	1.0	[3]	(1.8)	[3]
Total changes in goodwill	18.2		937.2
Balance at the end of the period	2,068.5		2,050.3
Accumulated impairment losses at the end of the period	(721.0)		(721.0)
Net goodwill, balance at the end of the period	1,347.5		1,329.3
U.S. car rental
Goodwill
Balance at the beginning of the period	997.0		122.5
Accumulated impairment losses at the beginning of the period	0		0
Net goodwill, balance at the beginning of the period	997.0		122.5
Goodwill acquired during the period	0.6		875.3
Adjustments to previously recorded purchase price allocation	13.2	[1]	0	[2]
Other changes during the period	0	[3]	(0.8)	[3]
Total changes in goodwill	13.8		874.5
Balance at the end of the period	1,010.8		997.0
Accumulated impairment losses at the end of the period	0		0
Net goodwill, balance at the end of the period	1,010.8		997.0
International car rental
Goodwill
Balance at the beginning of the period	245.1		245.7
Accumulated impairment losses at the beginning of the period	(46.1)		(46.1)
Net goodwill, balance at the beginning of the period	199.0		199.6
Goodwill acquired during the period	3.4		0
Adjustments to previously recorded purchase price allocation	0	[1]	0	[2]
Other changes during the period	1.0	[3]	(0.6)	[3]
Total changes in goodwill	4.4		(0.6)
Balance at the end of the period	249.5		245.1
Accumulated impairment losses at the end of the period	(46.1)		(46.1)
Net goodwill, balance at the end of the period	203.4		199.0
Worldwide equipment rental
Goodwill
Balance at the beginning of the period	772.4		693.8
Accumulated impairment losses at the beginning of the period	(674.9)		(674.9)
Net goodwill, balance at the beginning of the period	97.5		18.9
Goodwill acquired during the period	0		79.0
Adjustments to previously recorded purchase price allocation	0	[1]	0	[2]
Other changes during the period	0	[3]	(0.4)	[3]
Total changes in goodwill	0		78.6
Balance at the end of the period	772.4		772.4
Accumulated impairment losses at the end of the period	(674.9)		(674.9)
Net goodwill, balance at the end of the period	97.5		97.5
All Other Operations
Goodwill
Balance at the beginning of the period	35.8		51.1
Accumulated impairment losses at the beginning of the period	0		0
Net goodwill, balance at the beginning of the period	35.8		51.1
Goodwill acquired during the period	0		0
Adjustments to previously recorded purchase price allocation	0	[1]	(15.3)	[2]
Other changes during the period	0	[3]	0	[3]
Total changes in goodwill	0		(15.3)
Balance at the end of the period	35.8		35.8
Accumulated impairment losses at the end of the period	0		0
Net goodwill, balance at the end of the period	$ 35.8		$ 35.8

[1] Consists of adjustments related to certain liabilities, contracts and deferred tax during 2013.

[2] Consists of deferred tax adjustments recorded during 2012.

[3] Primarily consists of changes resulting from disposals and the translation of foreign currencies at different exchange rates from the beginning of the period year to the end of the year.