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Receivables, Net (Components Of Receivables, Net Of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Contracts-in-transit and vehicle receivables $ 189.0 $ 506.0
Trade receivables 117.0 136.4
Manufacturer receivables 172.3 234.5
Income taxes receivable (See Note 8) 0.0 1.5
Other 35.3 38.8
Receivables, gross 513.6 917.2
Less: allowances for credit losses (0.7) (0.5)
Receivables, net $ 512.9 $ 916.7