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Receivables, Net (Components Of Receivables, Net Of Allowances For Expected Credit Losses) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Contracts-in-transit and vehicle receivables $ 279.4 $ 445.8
Trade receivables 152.0 138.0
Manufacturer receivables 131.7 210.0
Other 68.3 55.1
Receivables, gross 631.4 848.9
Less: allowances for expected credit losses (3.3) (3.7)
Receivables, net $ 628.1 $ 845.2