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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 7,615.8 | $ 7,961.7 | $ 23,240.7 | $ 23,903.5
Net income attributable to Penske Automotive Group common stockholders | $ 226.6 | $ 272.2 | $ 692.8 | $ 892.7
Net income per diluted common share (in dollars per share) | $ 3.39 | $ 4.05 | $ 10.35 | $ 13.09

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