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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unrealized gain (loss) on interest rate swaps, tax:      
Unrealized (gain) loss arising during the period, tax (provision) benefit $ (1.2) $ 1.3 $ 0.0
Reclassification adjustment for (gain) loss included in floor plan interest expense, tax provision (benefit) $ 0.3 $ (0.2) $ 0.0