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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segments	Sep. 30, 2020 USD ($) segments
Segment Reporting Information [Line Items]
Number of reportable segments | segments			3	3
Revenues	$ 6,379.5	$ 5,404.9	$ 19,261.7	$ 14,604.9
Segment Income	555.9	379.3	1,557.2	839.1
AN Reportable Segment, Domestic [Member]
Segment Reporting Information [Line Items]
Revenues	1,955.2	1,734.5	5,926.7	4,704.0
Segment Income	149.1	111.9	436.6	248.1
AN Reportable Segment, Import [Member]
Segment Reporting Information [Line Items]
Revenues	1,983.3	1,621.5	5,927.9	4,308.9
Segment Income	200.7	123.5	530.3	277.7
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting Information [Line Items]
Revenues	2,218.0	1,870.0	6,790.0	5,051.6
Segment Income	$ 206.1	$ 143.9	$ 590.3	$ 313.3

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