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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 6,497.3 | $ 6,093.4 | $ 19,364.3 | $ 14,903.4
Income from continuing operations | 354.9 | 250.3 | 879.0 | 350.3
Net income | $ 355.1 | $ 250.4 | $ 879.3 | $ 350.5
Income from continuing operations per diluted common share (in dollars per share) | $ 4.46 | $ 3.11 | $ 10.95 | $ 4.36
Net income per diluted common share (in dollars per share) | $ 4.47 | $ 3.11 | $ 10.95 | $ 4.36

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