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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
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Mar. 31, 2014
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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%