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Revenues - Contract Balances (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Contract Balances
Accounts receivable, net	$ 737.7	$ 806.9
Unearned revenues	262.7	262.9
Unearned revenue recognized as revenue	155.7
Contracts in transit
Contract Balances
Accounts receivable, net	203.9	254.0
Vehicle receivables
Contract Balances
Accounts receivable, net	203.5	216.2
Manufacturer receivables
Contract Balances
Accounts receivable, net	144.0	193.6
Trade receivables
Contract Balances
Accounts receivable, net	$ 169.4	$ 135.3

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