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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 7,465.1 | $ 7,069.9 | $ 22,418.6 | $ 21,484.8
Net income attributable to Penske Automotive Group common stockholders | $ 263.7 | $ 342.4 | $ 866.0 | $ 1,094.0
Net income per diluted common share (in dollars per share) | $ 3.92 | $ 4.64 | $ 12.69 | $ 14.47

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