Employee Retirement Benefits (Estimated Future Benefit Payments & Other Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Total fair value of pension plan assets	$ 498.4		$ 423.2		$ 365.9
Pension Benefits
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2013	31.1
2014	34.4
2015	40.6
2016	44.3
2017	51.1
2018-2022	314.1
Total	515.6
Other Plans [Abstract]
Aggregate period contributions	7.5		7.2		6.7
Pension Benefits | Western Conference of Teamsters
Other Plans [Abstract]
Aggregate period contributions	4.1		3.9		3.8
Pension Benefits | Teamsters Central States
Other Plans [Abstract]
Aggregate period contributions	1.2		1.3		1.2
Pension Benefits | IAM National
Other Plans [Abstract]
Aggregate period contributions	0.7		0.6		0.6
Pension Benefits | Midwest Operating Engineers
Other Plans [Abstract]
Aggregate period contributions	0.5		0.4		0.2
Pension Benefits | Local 1034
Other Plans [Abstract]
Aggregate period contributions	0.2	[1]	0.2	[1]	0.2	[1]
Pension Benefits | Operating Engineers Local 324
Other Plans [Abstract]
Aggregate period contributions	0.1		0.1		0.1
Pension Benefits | Western Pennsylvania Teamsters
Other Plans [Abstract]
Aggregate period contributions	0.1	[2]	0.1	[2]	0.1	[2]
Pension Benefits | 7 Other Plans
Other Plans [Abstract]
Aggregate period contributions	0.6		0.6		0.5
Postretirement Benefits (U.S.)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2013	1.3
2014	1.4
2015	1.5
2016	1.4
2017	1.3
2018-2022	6.7
Total	$ 13.6
Minimum | Pension Benefits | Local 1034
Other Plans [Abstract]
Multiemployer Plan, Period Contributions, Percentage of Total Contributions to Pension Fund			5.00%

[1] The amount contributed by Hertz to the Local 1034 Pension Fund was reported as being more than 5% of total contributions to the plan, on the fund's Form 5500 for the year ended 12/31/2011.

[2] The parties are still attempting to negotiate a successor agreement.