Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Amortizable intangible assets:
Gross Carrying Amount	$ 1,155.2			$ 1,155.2			$ 1,154.3
Accumulated Amortization	(558.7)			(558.7)			(467.8)
Net Carrying Value	596.5			596.5			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	4,503.4			4,503.4			4,499.9
Accumulated Amortization	(558.7)			(558.7)			(467.8)
Net Carrying Value	3,944.7			3,944.7			4,032.1
Amortization of other intangible assets	30.3		19.9	90.9		58.9
Expected amortization expense for the remainder of 2013	30.5			30.5
Expected Amortization expense in 2014	118.5			118.5
Expected Amortization expense in 2015	115.0			115.0
Expected Amortization expense in 2016	65.6			65.6
Expected Amortization expense in 2017	52.8			52.8
Customer-related
Amortizable intangible assets:
Gross Carrying Amount	693.0			693.0			694.7
Accumulated Amortization	(485.3)			(485.3)			(434.0)
Net Carrying Value	207.7			207.7			260.7
Total Other intangible assets
Accumulated Amortization	(485.3)			(485.3)			(434.0)
Other amortizable intangible assets
Amortizable intangible assets:
Gross Carrying Amount	462.2	[1]		462.2	[1]		459.6	[1]
Accumulated Amortization	(73.4)	[1]		(73.4)	[1]		(33.8)	[1]
Net Carrying Value	388.8	[1]		388.8	[1]		425.8	[1]
Total Other intangible assets
Accumulated Amortization	(73.4)	[1]		(73.4)	[1]		(33.8)	[1]
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	[2]		$ 18.2	[2]		$ 15.6	[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.