Depreciation of Revenue Earning Equipment and Lease Charges (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	$ (37.2)	$ 96.8	$ 112.2
U.S. car rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	(48.2)	100.6	114.9
Net increase (decrease) in depreciation expenses	44.2	139.4	26.7
International car rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	(15.2)	(17.3)	(16.0)
Net increase (decrease) in depreciation expenses	(5.0)	(8.8)	(12.9)
Worldwide equipment rental
Revenue earning equipment
Net gains included in adjustment of depreciation upon disposal of revenue earning equipment	26.2	13.5	13.3
Net increase (decrease) in depreciation expenses	$ 0.4	$ (0.5)	$ 4.4