Schedule I (Parent Co Statement of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Net Income (loss)	$ 394.0	$ 271.2	$ 198.4
Cash flows from operating activities:
Net cash provided by operating activities	3,611.5	2,740.2	2,236.1
Cash flows from investing activities:
Increase (Decrease) in Restricted Cash	(308.3)	(241.6)	(101.7)
Payments to Acquire Revenue Earning Equipment	(10,298.4)	(9,612.8)	(9,431.9)
Proceeds from disposal of revenue earning equipment	7,264.1	7,125.1	7,850.4
Payments to Acquire Other Property, Plant, and Equipment	(313.8)	(297.1)	(281.7)
Proceeds from disposal of property and equipment	73.0	122.0	53.8
Captial Contributions to Subsidiaries	0	0	0
Distributions of Equity	0	0	0
Payments to Acquire Businesses, Net of Cash Acquired	(254.0)	(1,905.2)	(227.1)	0
Purchase of short-term investments, net	0	0	(32.9)
Net cash used in investing activities	(3,838.9)	(4,726.9)	(2,170.5)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,774.7	2,237.3	3,062.5
Repayments of Long-term Debt	(1,044.8)	(952.1)	(3,649.3)
Repayments of Short-term Debt, Maturing in More than Three Months	(1,017.5)	(1,280.1)	(1,194.1)
Proceeds from Lines of Credit	9,511.6	6,463.6	5,106.8
Payments under the revolving lines of credit	(9,104.5)	(5,190.5)	(5,164.1)
Dividends paid	(481.8)	(25.0)	(22.9)
Proceeds from employee stock purchase plan	5.1	4.3	3.6
Loan to Parent From Non-Guarantor	0	0	0
Loan with Hertz Global Holdings, Inc.	(79.8)	(13.2)	(1.0)
Payments to Acquire Additional Interest in Subsidiaries	0	(38.0)	0
Payments of Financing Costs	(54.3)	(49.4)	(91.5)
Net cash provided by (used in) financing activities	105.1	1,595.3	(1,512.2)
Net change in cash and cash equivalents during the period	(122.3)	(385.7)	(1,442.8)
Cash and cash equivalents at beginning of period	545.5	931.2	2,374.0
Cash and cash equivalents at end of period	423.2	545.5	931.2	2,374.0
Parent
Condensed Financial Statements, Captions [Line Items]
Net Income (loss)	394.0	271.2	198.4
Cash flows from operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	(212.8)	(1,149.0)	801.5
Net cash provided by operating activities	181.2	(877.8)	999.9
Cash flows from investing activities:
Increase (Decrease) in Restricted Cash	(23.4)	12.0	(28.6)
Payments to Acquire Revenue Earning Equipment	(149.5)	(87.7)	(141.4)
Proceeds from disposal of revenue earning equipment	136.4	79.4	163.3
Payments to Acquire Other Property, Plant, and Equipment	(192.4)	(173.1)	(189.5)
Proceeds from disposal of property and equipment	42.4	67.4	24.0
Captial Contributions to Subsidiaries	(937.9)	(2,989.7)	(3,549.1)
Distributions of Equity	1,133.9	3,106.7	2,590.0
Payments to Acquire Businesses, Net of Cash Acquired	0	(1,708.5)	(214.4)	0
Purchase of short-term investments, net	0	0	(32.9)
Net cash used in investing activities	9.5	(1,693.5)	(1,378.6)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	250.0	2,210.0	2,455.3
Repayments of Long-term Debt	(33.8)	(650.4)	(3,596.3)
Repayments of Short-term Debt, Maturing in More than Three Months	0	(26.8)	(29.2)
Proceeds from Lines of Credit	2,280.0	2,820.0	1,102.7
Payments under the revolving lines of credit	(2,323.0)	(2,600.0)	(1,131.9)
Dividends paid	(481.8)	(25.0)	(22.9)
Proceeds from employee stock purchase plan	5.1	4.3	3.6
Loan to Parent From Non-Guarantor	253.1	385.1	490.3
Loan with Hertz Global Holdings, Inc.	(79.8)	(13.2)	(1.0)
Payments to Acquire Additional Interest in Subsidiaries	0	(38.0)	0
Payments of Financing Costs	(9.0)	(35.2)	(81.2)
Net cash provided by (used in) financing activities	(139.2)	2,030.8	(810.6)
Net change in cash and cash equivalents during the period	51.5	(540.5)	(1,189.3)
Cash and cash equivalents at beginning of period	24.6	565.1	1,754.4
Cash and cash equivalents at end of period	$ 76.1	$ 24.6	$ 565.1	$ 1,754.4