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Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	$ 1,817.7		$ 1,529.9
Less: Allowance for doubtful accounts	(18.7)		(17.3)
Long-term portion of accounts receivable, net	(875.2)		(602.6)
Accounts receivable, net	923.8	$ 910.0	910.0
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	367.3		304.9
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	128.5		125.5
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	126.5		106.6
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	140.5		120.5
Auto loan and lease receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	1,036.4	829.2	829.2
Less: Allowance for doubtful accounts	(29.4)	(25.0)
Long-term portion of accounts receivable, net	(849.8)	(579.7)
Accounts receivable, net	157.2	$ 224.5
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Auto loan and lease receivables	$ 18.5		$ 43.2

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