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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 7,468.2 | $ 7,688.4
Net income attributable to Penske Automotive Group common stockholders | $ 215.4 | $ 304.6
Net income per diluted common share (in dollars per share) | $ 3.21 | $ 4.40

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