Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended	81 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	81 Months Ended	3 Months Ended		9 Months Ended		81 Months Ended	3 Months Ended		9 Months Ended		81 Months Ended	3 Months Ended			9 Months Ended		81 Months Ended	3 Months Ended		9 Months Ended		81 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2008 employee	Sep. 30, 2013	Dec. 31, 2008 Car Rental location	Sep. 30, 2013 Equipment Rental employee	Sep. 30, 2012 Equipment Rental	Sep. 30, 2013 Equipment Rental	Sep. 30, 2012 Equipment Rental	Dec. 31, 2008 Equipment Rental branch	Sep. 30, 2013 Equipment Rental	Sep. 30, 2013 Other	Sep. 30, 2012 Other	Sep. 30, 2013 Other	Sep. 30, 2012 Other	Sep. 30, 2013 Other	Sep. 30, 2013 Other reconciling items	Sep. 30, 2012 Other reconciling items	Sep. 30, 2013 Other reconciling items	Sep. 30, 2012 Other reconciling items	Sep. 30, 2013 Other reconciling items	Sep. 30, 2013 U.S. car rental	Mar. 31, 2013 U.S. car rental employee	Sep. 30, 2012 U.S. car rental	Sep. 30, 2013 U.S. car rental	Sep. 30, 2012 U.S. car rental	Sep. 30, 2013 U.S. car rental	Sep. 30, 2013 International car rental	Sep. 30, 2012 International car rental employee	Sep. 30, 2013 International car rental	Sep. 30, 2012 International car rental	Sep. 30, 2013 International car rental	Sep. 30, 2013 Termination benefits	Sep. 30, 2012 Termination benefits	Sep. 30, 2013 Termination benefits		Sep. 30, 2012 Termination benefits	Sep. 30, 2013 Pension and Post Retirement expense	Sep. 30, 2012 Pension and Post Retirement expense	Sep. 30, 2013 Pension and Post Retirement expense		Sep. 30, 2012 Pension and Post Retirement expense	Sep. 30, 2013 Consultant costs	Sep. 30, 2012 Consultant costs	Sep. 30, 2013 Consultant costs		Sep. 30, 2012 Consultant costs	Sep. 30, 2013 Relocation Costs	Sep. 30, 2012 Relocation Costs	Sep. 30, 2013 Relocation Costs	Sep. 30, 2012 Relocation Costs	Sep. 30, 2013 Facility closure and lease obligation costs	Sep. 30, 2012 Facility closure and lease obligation costs	Sep. 30, 2013 Facility closure and lease obligation costs	Sep. 30, 2012 Facility closure and lease obligation costs	Sep. 30, 2013 Facility closures	Sep. 30, 2013 Accelerated Equity Award Compensation	Sep. 30, 2013 Foreign currency translation	Sep. 30, 2013 Other	Sep. 30, 2012 Other	Sep. 30, 2013 Other		Sep. 30, 2012 Other	Sep. 30, 2013 Selling, General and Administrative Expense [Member]	Sep. 30, 2012 Selling, General and Administrative Expense [Member]	Sep. 30, 2013 Selling, General and Administrative Expense [Member]	Sep. 30, 2012 Selling, General and Administrative Expense [Member]	Sep. 30, 2013 Direct Operating Expense [Member]	Sep. 30, 2012 Direct Operating Expense [Member]	Sep. 30, 2013 Direct Operating Expense [Member]	Sep. 30, 2012 Direct Operating Expense [Member]
Restructuring details
Charges incurred			$ 57.6																																			$ 32.3					$ 0.1					$ 1.5																$ 23.7
Number of off-airport locations closed								250
Number of branches in U.S. equipment rental segment closed													22
Number of employees impacted						9,610			480																	50						515
Restructuring charges incurred to date							625.9							232.7					2.0					73.6						101.7					215.9
Restructuring charges	36.3	1.5	57.6		24.3				1.1	0	2.4	7.1			0	0	0	0		19.2	1.3	20.3	1.7		7.4		1.3	18.3	5.7		8.6	(1.1)	16.6	9.8		14.8	0.3	32.3		16.5	0.1	0	0.1		0	0.7	0.1	1.5		0.7	14.0	0.1	14.1	0.1	6.7	0.9	9.6	6.6				0	0.1	0		0.4	26.4	(2.2)	39.4	8.7	9.9	3.7	18.2	15.6
Restructuring and Related Activities Liability Payment Period																																						12 months
Restructuring reserve
Balance at beginning of period			21.0																																			12.4					0.2					0.3																8.1
Charges incurred	36.3	1.5	57.6		24.3				1.1	0	2.4	7.1			0	0	0	0		19.2	1.3	20.3	1.7		7.4		1.3	18.3	5.7		8.6	(1.1)	16.6	9.8		14.8	0.3	32.3		16.5	0.1	0	0.1		0	0.7	0.1	1.5		0.7	14.0	0.1	14.1	0.1	6.7	0.9	9.6	6.6				0	0.1	0		0.4	26.4	(2.2)	39.4	8.7	9.9	3.7	18.2	15.6
Cash payments			(29.3)																																			(25.4)					(0.2)					(1.6)																(2.1)
Other			(11.3)	[1]																																		(1.6)	[1]				(0.1)	[1]				0	[1]										(9.6)	(1.6)	(0.1)			(9.6)	[1]
Balance at end of period	$ 38.0		$ 38.0				$ 38.0																													$ 17.7		$ 17.7			$ 0		$ 0			$ 0.2		$ 0.2														$ 20.1		$ 20.1

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