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Receivables, Net (Components of Receivables, Net of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]    
Trade receivables $ 130.4 $ 162.6
Manufacturer receivables 242.3 253.3
Other 31.4 44.9
Trade, manufacturer and other receivables, gross 404.1 460.8
Less: allowances for doubtful accounts (4.6) (5.5)
Trade, manufacturer and other receivables, net 399.5 455.3
Contracts-in-transit and vehicle receivables 568.6 655.7
Income taxes receivable (See Note 11) 8.1 0.0
Receivables, net $ 976.2 $ 1,111.0