Depreciation of Revenue Earning Equipment and Lease Charges (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
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	$ (11.3)	$ 41.2	$ (10.0)	$ 80.6
Car Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	(17.5)	38.3	(20.8)	73.2
Net increase (decrease) in depreciation expenses	14.8		15.5
Equipment Rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	6.2	2.9	10.8	7.4
Net increase (decrease) in depreciation expenses	$ 0.1		$ 0