Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Mar. 31, 2013	Dec. 31, 2012
Amortizable intangible assets:
Gross Carrying Amount	$ 1,148.6			$ 1,148.6				$ 1,154.3
Accumulated Amortization	(528.3)			(528.3)				(467.8)
Net Carrying Value	620.3			620.3				686.5
Indefinite-lived intangible assets:
Gross Carrying Amount	3,348.2			3,348.2				3,345.6
Total Other intangible assets
Gross Carrying Amount	4,496.8			4,496.8				4,499.9
Accumulated Amortization	(528.3)			(528.3)				(467.8)
Net Carrying Value	3,968.5			3,968.5			3,968.5	4,032.1
Amortization of other intangible assets	30.2		19.8	60.7		39.0
Expected amortization expense for the remainder of 2013	60.0			60.0
Expected Amortization expense in 2014	116.4			116.4
Expected Amortization expense in 2015	113.9			113.9
Expected Amortization expense in 2016	64.9			64.9
Expected Amortization expense in 2017	51.8			51.8
Customer-related
Amortizable intangible assets:
Gross Carrying Amount	694.6			694.6				694.7
Accumulated Amortization	(468.5)			(468.5)				(434.0)
Net Carrying Value	226.1			226.1				260.7
Total Other intangible assets
Accumulated Amortization	(468.5)			(468.5)				(434.0)
Other amortizable intangible assets
Amortizable intangible assets:
Gross Carrying Amount	454.0	[1]		454.0	[1]			459.6	[2]
Accumulated Amortization	(59.8)	[1]		(59.8)	[1]			(33.8)	[2]
Net Carrying Value	394.2	[1]		394.2	[1]			425.8	[2]
Total Other intangible assets
Accumulated Amortization	(59.8)	[1]		(59.8)	[1]			(33.8)	[2]
Trade name
Indefinite-lived intangible assets:
Gross Carrying Amount	3,330.0			3,330.0				3,330.0
Other indefinite-lived intangible assets
Indefinite-lived intangible assets:
Gross Carrying Amount	$ 18.2	[3]		$ 18.2	[3]			$ 15.6	[3]

[1] .

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

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