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Stockholders' Equity - Reclassification From Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Floor plan interest expense $ (62.3) $ (39.3) $ (25.6)
Income tax provision 71.8 101.9 86.4
Net income 265.7 245.2 197.1
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income      
Floor plan interest expense 0.0 0.0 (0.2)
Income tax provision 0.0 0.0 0.1
Net income $ 0.0 $ 0.0 $ (0.1)