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Receivables, Net (Components Of Receivables, Net Of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade receivables $ 132.7 $ 130.4
Manufacturer receivables 198.5 242.3
Other 32.4 31.4
Trade, manufacturer and other receivables, gross 363.6 404.1
Less: allowances for doubtful accounts (4.3) (4.6)
Trade, manufacturer and other receivables, net 359.3 399.5
Contracts-in-transit and vehicle receivables 423.4 568.6
Income taxes receivable (See Note 9) 0.0 8.1
Receivables, net $ 782.7 $ 976.2