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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
Reclassification adjustment for loss included in floor plan interest expense, tax provision $ 0.0 $ 0.7 $ 0.0 $ 2.2