Debt - Borrowing Capacity and Availability (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,651.1
Availability Under Borrowing Base Limitation	752.5
Senior ABL Facility
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	750.4
Availability Under Borrowing Base Limitation	750.4
Corporate Debt
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	750.4
Availability Under Borrowing Base Limitation	750.4
U.S. Fleet Variable Funding Notes
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	243.8
Availability Under Borrowing Base Limitation	0
RCFC US Fleet Variable Funding Notes
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	132.0
Availability Under Borrowing Base Limitation	0
Donlen GN II Variable Funding Note Facility
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	155.0
Availability Under Borrowing Base Limitation	0
U.S. Fleet Financing Facility
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	28.0
Availability Under Borrowing Base Limitation	0
European Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	0
Availability Under Borrowing Base Limitation	0
European Securitization
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	80.3
Availability Under Borrowing Base Limitation	0
Canadian Securitization
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	48.5
Availability Under Borrowing Base Limitation	0
Dollar Thrifty Sponsored Canadian Securitization
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	85.3
Availability Under Borrowing Base Limitation	0
Australian Securitization
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	127.8
Availability Under Borrowing Base Limitation	2.1
Fleet debt
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	900.7
Availability Under Borrowing Base Limitation	$ 2.1