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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2024
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 7,964.7 | $ 15,689.0
Net income attributable to Penske Automotive Group common stockholders | $ 245.8 | $ 465.7
Net income per diluted common share (in dollars per share) | $ 3.67 | $ 6.95

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