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Interim Financial Statements (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 30, 2013 item | Mar. 31, 2014 item | Mar. 31, 2013 | Dec. 31, 2013
Interim Financial Statements. |  |  |  |
Number of people employed worldwide |  | 18,000 |  |
Total revenues |  | $ 4,048.0 | $ 3,349.3 | $ 14,700.0
Minimum number of vehicles retailed and wholesaled |  | 115,000 |  |
Total number of owned and operated franchises |  | 323 |  |
Number of owned and operated franchises in US |  | 175 |  |
Number of owned and operated franchises outside US |  | 148 |  |
Interim Financial Statements |  |  |  |
Minimum number of vehicle brands offered |  | 35 |  |
Number of franchises awarded to the reporting entity |  | 1 |  |
Number of franchises disposed of |  | 3 |  |
Number of commercial vehicle dealership | 3 |  |  |
Hertz car rental franchise |  |  |  |
Interim Financial Statements |  |  |  |
Number of acquired franchises |  |  | 1 |
Number of vehicles in the fleet |  | 5,900 |  |
Minimum number of on and off-airport locations in which company operates |  | 50 |  |
Penske Commercial Vehicles |  |  |  |
Interim Financial Statements |  |  |  |
Minimum number of dealership locations where business distributes vehicles and parts including three company-owned retail commercial vehicle dealerships | 70 |  |  |
Penske Truck Leasing Co., L.P. |  |  |  |
Interim Financial Statements |  |  |  |
Limited partnership interest (as a percent) |  | 9.00% |  |
BMW |  |  |  |
Interim Financial Statements |  |  |  |
Number of acquired franchises |  | 1 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |  |
Interim Financial Statements |  |  |  |
Concentration Risk, Percentage |  | 59.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |  |
Interim Financial Statements |  |  |  |
Concentration Risk, Percentage |  | 41.00% |  |
Automotive dealership revenues | Premium brands |  |  |  |
Interim Financial Statements |  |  |  |
Concentration Risk, Percentage |  | 72.00% |  |

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- Definition Represents the minimum number of dealership locations where business distributes vehicles and parts including company-owned retail commercial vehicle dealerships. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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