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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - 2021 Acquisitions $ in Millions	Sep. 30, 2021 USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 1.1
Inventories, net	565.6
Property and equipment, net	112.6
Other non-current assets	2,117.4
Floor plan notes payable	(3.9)
Other long-term liabilities	(28.0)
Assets acquired and liabilities assumed	$ 2,764.8

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Floor Plan Notes Payable

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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