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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 921.3	$ 720.9
Less: Allowance for doubtful accounts	(8.4)	(5.9)
Less: Long-term portion of accounts receivable, net	(172.2)	(101.0)
Accounts receivable, net	740.7	614.0
Contracts in transit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	375.3	286.8
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	71.0	67.0
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	88.0	61.8
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	119.4	118.1
Auto loan receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	256.0	175.6
Less: Allowance for doubtful accounts	(12.4)
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 11.6	$ 11.6

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