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Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Franchise rights impairment | $ 0 | $ 4.2 | $ 0
Franchise rights - indefinite-lived | 329.3 | 285.7 |
Franchise rights [Member] |  |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Date of annual goodwill and indefinite lived intangible assets impairment test | April 30 | April 30 | April 30
Nonrecurring [Member] | Franchise rights [Member] |  |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Franchise rights impairment | 0 | 4.2 | 0
Franchise rights impairment, after tax |  | 2.6 |
Operating Segments, Domestic [Member] |  |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Franchise rights - indefinite-lived | 22.8 |  |
Operating Segments, Import [Member] |  |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Franchise rights - indefinite-lived | 122.5 |  |
Operating Segments, Premium Luxury [Member] |  |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |  |
Franchise rights - indefinite-lived | $ 184.0 |  |

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- Definition The date of the annual goodwill and indefinite-lived franchise rights impairment test. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period, resulting from the write-down of the carrying amount of an indefinite-lived intangible asset, other than goodwill, to fair value, net of taxes. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an indefinite-lived intangible asset, other than goodwill, to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 46 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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