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Revenues - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract Balances
Accounts receivable, net	$ 806.9	$ 960.3
Unearned revenues	262.9	262.9
Revenue recognized from unearned revenue	259.7
Contracts in transit
Contract Balances
Accounts receivable, net	254.0	291.1
Vehicle receivables
Contract Balances
Accounts receivable, net	216.2	249.8
Manufacturer receivables
Contract Balances
Accounts receivable, net	193.6	244.6
Trade receivables
Contract Balances
Accounts receivable, net	$ 135.3	$ 164.7

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