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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 29,727.6 | $ 28,624.7
Income from continuing operations attributable to Penske Automotive Group common stockholders | 1,057.0 | 1,393.4
Net income attributable to Penske Automotive Group common stockholders | $ 1,057.0 | $ 1,393.4
Income from continuing operations per diluted common share (in dollars per share) | $ 15.55 | $ 18.73
Net income per diluted common share (in dollars per share) | $ 15.55 | $ 18.73

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