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Interim Financial Statements - Business Overview (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 item | Feb. 28, 2015 item | Mar. 31, 2016 USD ($) item | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2016 | Oct. 31, 2014
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 4,824.6 | $ 4,482.9 |  |  |
German Automotive Dealership Group |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  | 8.00% |  |  |  |
Ownership interest (as a percent) |  |  | 68.00% |  |  |  |
Nicole Group | BMW Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of dealerships operated |  |  | 4 |  |  |  |
Nicole Group | MINI Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of dealerships operated |  |  | 3 |  |  |  |
Harper Truck Centres |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of dealerships operated | 5 |  |  |  |  |  |
Penske Truck Leasing Co., L.P. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Limited partnership interest (as a percent) |  |  | 9.00% | 9.00% |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total number of owned and operated franchises |  |  | 349 |  |  |  |
Number of owned and operated franchises in US |  |  | 179 |  |  |  |
Number of owned and operated franchises outside US |  |  | 170 |  |  |  |
Minimum number of vehicles retailed and wholesaled |  |  | 134,000 |  |  |  |
Minimum number of vehicle brands offered |  |  | 40 |  |  |  |
Number of franchises disposed |  |  | 7 |  |  |  |
Retail Automotive Dealership | Nicole Group |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership percentage of Equity Method Investment |  |  |  |  |  | 49.00% |
Retail Automotive Dealership | UK |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of acquired franchises |  |  | 1 |  |  |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of operating locations |  |  | 14 |  |  |  |
Number of full service retail locations operated |  |  | 10 |  |  |  |
Number of full service retail locations acquired |  | 2 |  |  |  |  |
Retail Commercial Truck Dealership | PTG |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 96.00% |  |  |  |
Ownership acquired (as a percentage) |  |  |  |  | 5.00% |  |
Ownership percentage of Equity Method Investment |  |  |  |  |  |  | 32.00%
Commercial Vehicle Distribution |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Minimum number of dealership locations |  |  | 70 |  |  |  |
Number of commercial vehicle dealerships |  |  | 3 |  |  |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 57.00% |  |  |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 43.00% |  |  |  |
Automotive dealership revenues | Premium brands |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 72.00% |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 4,512.9 | $ 4,186.8 | $ 17,900.0 |  |
Retail Commercial Truck Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  |  | 206.7 | 192.7 |  |  |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  |  | $ 105.0 | $ 103.4 |  |  |

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