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Interim Financial Statements (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Aug. 30, 2013
item
Jun. 30, 2014
item
Jun. 30, 2013
Jun. 30, 2014
item
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Bremen, Germany
item
Jun. 30, 2013
Hertz car rental franchise
item
Jun. 30, 2014
Hertz car rental franchise
item
Aug. 30, 2013
Penske Commercial Vehicles
item
Jun. 30, 2014
Penske Truck Leasing Co., L.P.
Jun. 30, 2014
Skipton VW
UK
item
Jul. 31, 2014
BMW
Subsequent event
item
Jun. 30, 2014
BMW
US
item
Jun. 30, 2014
Automotive dealership revenues
Geographic
U.S. and Puerto Rico
Jun. 30, 2014
Automotive dealership revenues
Geographic
Outside the U.S.
Jun. 30, 2014
Automotive dealership revenues
Premium brands
Interim Financial Statements.                                  
Number of people employed worldwide       19,900                          
Total revenues   $ 4,406.7 $ 3,630.6 $ 8,454.7 $ 6,979.9 $ 14,700.0                      
Minimum number of vehicles retailed and wholesaled       236,000                          
Total number of owned and operated franchises   324   324                          
Number of owned and operated franchises in US   177   177                          
Number of owned and operated franchises outside US   147   147                          
Interim Financial Statements                                  
Automotive dealership revenues (as a percent)                             61.00% 39.00% 71.00%
Minimum number of vehicle brands offered       35                          
Number of acquired franchises               1       1   1      
Number of franchises awarded to the reporting entity       4                          
Number of franchises disposed of       7     4                    
Additional investment amount                         $ 16.6        
Additional ownership interest acquired (as a percent)                         50.00%        
Number of operating franchises                         8        
Minimum number of dealership locations where business distributes vehicles and parts including three company-owned retail commercial vehicle dealerships                   70              
Number of commercial vehicle dealership 3                                
Number of vehicles in the fleet                 6,800                
Minimum number of on and off-airport locations in which company operates                 50                
Limited partnership interest (as a percent)                     9.00%