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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 7,695.3 | $ 7,657.6 | $ 22,980.8 | $ 23,365.0
Net income attributable to Penske Automotive Group common stockholders | $ 213.0 | $ 226.6 | $ 708.0 | $ 692.9
Net income per diluted common share (in dollars per share) | $ 3.23 | $ 3.39 | $ 10.67 | $ 10.35

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