Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended										3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Senior Subordinated Notes	Sep. 30, 2012 8.875% Senior Notes due January 2014	Feb. 29, 2012 8.875% Senior Notes due January 2014	Sep. 30, 2012 7.875% Senior Notes due January 2014	Feb. 29, 2012 7.875% Senior Notes due January 2014	Sep. 30, 2012 Total reportable segments	Sep. 30, 2011 Total reportable segments	Sep. 30, 2012 Total reportable segments	Sep. 30, 2011 Total reportable segments	Sep. 30, 2012 Car Rental	Sep. 30, 2011 Car Rental	Sep. 30, 2012 Car Rental	Sep. 30, 2011 Car Rental	Sep. 30, 2012 Equipment Rental	Sep. 30, 2011 Equipment Rental	Sep. 30, 2012 Equipment Rental	Sep. 30, 2011 Equipment Rental	Sep. 30, 2012 Other reconciling items		Sep. 30, 2011 Other reconciling items		Sep. 30, 2012 Other reconciling items		Sep. 30, 2011 Other reconciling items		Sep. 30, 2012 Purchase accounting		Sep. 30, 2011 Purchase accounting		Sep. 30, 2012 Purchase accounting		Sep. 30, 2011 Purchase accounting		Sep. 30, 2012 Non Cash debt charges		Sep. 30, 2011 Non Cash debt charges		Sep. 30, 2012 Non Cash debt charges		Sep. 30, 2011 Non Cash debt charges		Sep. 30, 2012 Restructuring charges	Sep. 30, 2011 Restructuring charges	Sep. 30, 2012 Restructuring charges	Sep. 30, 2011 Restructuring charges	Sep. 30, 2012 Restructuring related charges		Sep. 30, 2011 Restructuring related charges		Sep. 30, 2012 Restructuring related charges		Sep. 30, 2011 Restructuring related charges		Sep. 30, 2012 Derivative gains (losses)		Sep. 30, 2011 Derivative gains (losses)		Sep. 30, 2012 Derivative gains (losses)		Sep. 30, 2011 Derivative gains (losses)		Sep. 30, 2012 Management transition costs	Sep. 30, 2011 Management transition costs	Sep. 30, 2012 Management transition costs	Sep. 30, 2011 Management transition costs	Sep. 30, 2012 Acquisition related costs	Sep. 30, 2011 Acquisition related costs	Sep. 30, 2012 Acquisition related costs	Sep. 30, 2011 Acquisition related costs	Sep. 30, 2012 Pension Costs [Member]		Sep. 30, 2011 Pension Costs [Member]		Sep. 30, 2012 Premiums Paid on Debt [Member]		Sep. 30, 2011 Premiums Paid on Debt [Member]		Sep. 30, 2012 Other	Sep. 30, 2011 Other	Sep. 30, 2012 Other	Sep. 30, 2011 Other
Reconciling items:
Revenues	$ 2,516,222,000	$ 2,432,266,000	$ 6,702,294,000	$ 6,284,562,000						$ 2,515,600,000	$ 2,430,800,000	$ 6,700,500,000	$ 6,279,900,000	$ 2,152,600,000	$ 2,109,100,000	$ 5,700,400,000	$ 5,388,300,000	$ 363,000,000	$ 321,700,000	$ 1,000,100,000	$ 891,600,000																																																													$ 600,000	$ 1,500,000	$ 1,800,000	$ 4,700,000
Adjustments:
Adjusted Pre-Tax Income (Loss)	382,075,000	308,248,000	529,710,000	268,502,000						504,900,000	431,200,000	942,400,000	778,300,000	428,700,000	375,300,000	797,800,000	678,800,000	76,200,000	55,900,000	144,600,000	99,500,000	(73,800,000)	[1]	(77,900,000)	[1]	(235,600,000)	[1]	(244,100,000)	[1]	(23,900,000)	[2]	(19,100,000)	[2]	(76,900,000)	[2]	(62,200,000)	[2]	(13,600,000)	[3]	(14,800,000)	[3]	(46,100,000)	[3]	(89,900,000)	[3]	(1,500,000)	(1,900,000)	(27,000,000)	(40,400,000)	(2,000,000)	[4]	(3,200,000)	[4]	(7,600,000)	[4]	(6,400,000)	[4]	100,000	[5]	100,000	[5]	100,000	[5]	100,000	[5]	0	(1,500,000)	0	(4,000,000)	(8,100,000)	(4,600,000)	(19,600,000)	(13,600,000)	0	[6]	13,100,000	[6]	0	[7]	(62,400,000)	[7]
Adjusted Pre-Tax Income (Loss)		308,300,000
Interest rate (as a percent)					10.50%	8.875%	8.875%	7.875%	7.875%
Increase in assets			$ 1,879,700,000

[1] Represents general corporate expenses, certain interest expense (including net interest on corporate debt), as well as other business activities.

[2] Represents the purchase accounting effects of the Acquisition on our results of operations relating to increased depreciation and amortization of tangible and intangible assets and accretion of revalued workers' compensation and public liability and property damage liabilities. Also represents the purchase accounting effects of subsequent acquisitions on our results of operations relating to increased depreciation and amortization of tangible and intangible assets.

[3] Represents non-cash debt charges relating to the amortization and write-off of deferred debt financing costs and debt discounts.

[4] Represents incremental costs incurred directly supporting our business transformation initiatives. Such costs include transition costs incurred in connection with our business process outsourcing arrangements and incremental costs incurred to facilitate business process re-engineering initiatives that involve significant organization redesign and extensive operational process changes.

[5] Represents the mark-to-market adjustment on our interest rate cap.

[6] Represents a gain for the U.K. pension plan relating to unamortized prior service cost from a 2010 amendment that eliminated discretionary pension increases related to pre-1997 service primarily pertaining to inactive employees.

[7] Represents premiums paid to redeem our 10.5% Senior Subordinated Notes and a portion of our 8.875% Senior Notes.