Goodwill and Other Intangible Assets (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Amortizable intangible assets:
Gross Carrying Amount	$ 1,152,000,000			$ 1,154,300,000
Accumulated Amortization	(498,200,000)			(467,800,000)
Net Carrying Value	653,800,000			686,500,000
Indefinite-lived intangible assets:
Gross Carrying Amount	3,348,200,000			3,345,600,000
Total Other intangible assets
Gross Carrying Amount	4,500,200,000			4,499,900,000
Accumulated Amortization	(498,200,000)			(467,800,000)
Net Carrying Value	4,002,046,000			4,032,111,000
Amortization of other intangible assets	30,499,000		19,166,000
Expected amortization expense for the remainder of 2013	90,100,000
Expected Amortization expense in 2014	116,300,000
Expected Amortization expense in 2015	113,800,000
Expected Amortization expense in 2016	64,900,000
Expected Amortization expense in 2017	51,800,000
Customer-related
Amortizable intangible assets:
Gross Carrying Amount	694,600,000			694,700,000
Accumulated Amortization	(451,300,000)			(434,000,000)
Net Carrying Value	243,300,000			260,700,000
Total Other intangible assets
Accumulated Amortization	(451,300,000)			(434,000,000)
Other amortizable intangible assets
Amortizable intangible assets:
Gross Carrying Amount	457,400,000	[1]		459,600,000	[1]
Accumulated Amortization	(46,900,000)	[1]		(33,800,000)	[1]
Net Carrying Value	410,500,000	[1]		425,800,000	[1]
Total Other intangible assets
Accumulated Amortization	(46,900,000)	[1]		(33,800,000)	[1]
Trade name
Indefinite-lived intangible assets:
Gross Carrying Amount	3,330,000,000			3,330,000,000
Other indefinite-lived intangible assets
Indefinite-lived intangible assets:
Gross Carrying Amount	$ 18,200,000	[2]		$ 15,600,000	[2]

[1] Other amortizable intangible assets primarily include Dollar Thrifty concession agreements, Donlen trade name, reacquired franchise rights, non-compete agreements and technology-related intangibles.

[2] Other indefinite-lived intangible assets primarily consist of reacquired franchise rights.