Depreciation of Revenue Earning Equipment and Lease Charges (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	$ 1.3	$ 39.4
Car Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	(3.3)	34.9
Increase in depreciation expense	(0.7)	(0.2)
Equipment Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	4.6	4.5
Increase in depreciation expense	$ 0.1