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Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segments	Mar. 31, 2020 USD ($) segments
Segment Reporting Information [Line Items]
Number of reportable segments | segments	3	3
Revenues	$ 5,903.8	$ 4,667.0
Segment Income	402.9	200.2
AN Reportable Segment, Domestic [Member]
Segment Reporting Information [Line Items]
Revenues	1,846.7	1,483.5
Segment Income	118.5	54.1
AN Reportable Segment, Import [Member]
Segment Reporting Information [Line Items]
Revenues	1,769.6	1,362.1
Segment Income	125.9	65.9
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information [Line Items]
Revenues	2,103.5	1,616.8
Segment Income	$ 158.5	$ 80.2

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