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Revenues - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract Balances
Accounts receivable, net	$ 960.3	$ 929.1
Unearned revenues	262.9	269.8
Revenue recognized from unearned revenue	258.3
Contracts in transit
Contract Balances
Accounts receivable, net	291.1	314.2
Vehicle receivables
Contract Balances
Accounts receivable, net	249.8	266.9
Manufacturer receivables
Contract Balances
Accounts receivable, net	244.6	211.3
Trade receivables
Contract Balances
Accounts receivable, net	$ 164.7	$ 129.1

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