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Receivables, Net (Components Of Receivables, Net Of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade receivables $ 126.3 $ 162.6
Manufacturer receivables 201.5 253.3
Other 32.5 44.9
Trade, manufacturer and other receivables, gross 360.3 460.8
Less: allowances for doubtful accounts (4.0) (5.5)
Trade, manufacturer and other receivables, net 356.3 455.3
Contracts-in-transit and vehicle receivables 431.5 655.7
Income taxes receivable (see Note 7) 12.7 0.0
Receivables, net $ 800.5 $ 1,111.0