Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Goodwill
Balance at the beginning of the period	$ 2,062.9		$ 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	1,341.9		392.1
Goodwill acquired during the period	1.5		966.9
Adjustments to previously recorded purchase price allocation	21.8	[1]	(15.3)	[2]
Other changes during the period	1.1	[3]	(1.8)	[4]
Total changes in goodwill	24.4		949.8
Balance at the end of the period	2,087.3		2,062.9
Accumulated impairment losses at the end of the period	(721.0)		(721.0)
Net goodwill, balance at the end of the period	1,366.3		1,341.9
U.S. car rental
Goodwill
Balance at the beginning of the period	1,006.6		122.5
Accumulated impairment losses at the beginning of the period	0		0
Net goodwill, balance at the beginning of the period	1,006.6		122.5
Goodwill acquired during the period	0		884.9
Adjustments to previously recorded purchase price allocation	20.1	[1]	0	[2]
Other changes during the period	1.1	[3]	(0.8)	[4]
Total changes in goodwill	21.2		884.1
Balance at the end of the period	1,027.8		1,006.6
Accumulated impairment losses at the end of the period	0		0
Net goodwill, balance at the end of the period	1,027.8		1,006.6
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	1.5		0
Adjustments to previously recorded purchase price allocation	0	[1]	0	[2]
Other changes during the period	(0.1)	[3]	(0.6)	[4]
Total changes in goodwill	1.4		(0.6)
Balance at the end of the period	246.5		245.1
Accumulated impairment losses at the end of the period	(46.1)		(46.1)
Net goodwill, balance at the end of the period	200.4		199.0
Equipment Rental
Goodwill
Balance at the beginning of the period	775.4		693.8
Accumulated impairment losses at the beginning of the period	(674.9)		(674.9)
Net goodwill, balance at the beginning of the period	100.5		18.9
Goodwill acquired during the period	0		82.0
Adjustments to previously recorded purchase price allocation	1.7	[1]	0	[2]
Other changes during the period	0.1	[3]	(0.4)	[4]
Total changes in goodwill	1.8		81.6
Balance at the end of the period	777.2		775.4
Accumulated impairment losses at the end of the period	(674.9)		(674.9)
Net goodwill, balance at the end of the period	102.3		100.5
Other
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	[4]
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 purchase accounting and deferred tax during 2013.

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

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

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