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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Options Convenants | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract] |  |  |
Lease exit expense | $ 4.3 |  |
Lease exit accrued cost | 1.1 |  |
Remaining lease exit expense | 3.2 |  |
Component of lease exit expense in interest expense, other, net | 0.4 |  |
Component of lease exit expense in selling, general and administrative expenses | 0.4 |  |
Component of lease exit expense in income (loss) from operations and the sale of dealerships | 4.3 |  |
Component of lease exit payments in selling, general and administrative expenses | 1.3 |  |
Component of lease exit payments in income (loss) from operations and the sale of dealerships | 7.4 |  |
Operating lease term for dealership facilities, minimum | 15 years |  |
Operating lease term for dealership facilities, maximum | 20 years |  |
Operating lease Number of renewal options, minimum | 1 |  |
Amended subordination and guarantee agreement number of additional covenants | 2 |  |
Operating lease number of renewal options, maximum | 2 |  |
Operating lease period of renewal options | 10 years |  |
Percentage of lease facility based on capitalization rates | 20.00% |  |
Lease expense for continuing operation | 102.4 | 103.2 | 106.0
Lease expense for discontinuing operation | 6.2 | 5.7 | 9.5
Leases, net contingent rent benefit related to decrease in interest rates from continuing operation | 2.4 | 2.4 | 2.4
Leases Net Contingent Rent Benefit Related to Decrease in Interest Rates from Discontinuing Operation | 0.5 | 0.5 | 0.5
Obligations under subleases, if subleases do not perform | 113.9 |  |
Estimated minimum lease payment | 9.1 |  |
Maximum exposure associated with general indemnifications | 23.8 |  |
General Indemnifications Minimum Expiration Period | 1 year |  |
General Indemnifications Maximum Expiration Period | 2 years |  |
Period of arbitration, stayed by Arbitrator | 30 days |  |
Amount reserved for pending proceedings |  | 7.3 |
Contingent Liability Reserve Balance after reduction | $ 3.4 |  |

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