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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Business Combinations [Abstract] |  |  |  |
Total revenues | $ 1,068.5 | $ 941.0 | $ 3,248.5 | $ 2,713.4
Income before income taxes | 242.6 | 221.5 | 796.3 | 693.0
Net income | $ 176.1 | $ 163.7 | $ 605.9 | $ 535.2
Net income per share: |  |  |  |
Basic | $ 0.62 | $ 0.58 | $ 2.14 | $ 1.89
Diluted | $ 0.62 | $ 0.58 | $ 2.13 | $ 1.89
Weighted average number of shares outstanding: |  |  |  |
Basic | 279.9 | 277.8 | 279.3 | 277.3
Diluted | 281.3 | 278.7 | 280.4 | 278.5

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