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Derivatives and Hedging (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Interest Rate Swap Agreements
    
Derivative    
Hedge ineffectiveness recorded $ 0 $ 0
Interest Rate Swap Agreements | Fair Value, Inputs, Level 2
    
Derivative    
Estimated liabilities of swaps designated as hedging instruments, fair value 6.2 7.7
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt
    
Derivative    
Increase in the weighted average interest rate on floor plan borrowings due to the swaps (as a percent) 0.28%  
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | LIBOR portion
    
Derivative    
Portion of floating rate floor plan debt fixed by swap agreements 300.0  
Interest rate swap, fixed (as a percent) 2.135%  
Interest Rate Swap Agreements | Floating Rate Floor Plan Debt | Fixed rate portion
    
Derivative    
Portion of floating rate floor plan debt fixed by swap agreements 100.0  
Interest rate swap, fixed (as a percent) 1.55%  
Forward foreign exchange contracts | Fair Value, Inputs, Level 2
    
Derivative    
Estimated asset of contracts designated as hedging instruments, fair value $ 1.2