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Business Combinations - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Business Combinations [Abstract] |  |  |  |
Total revenues | $ 1,048.3 | $ 848.9 | $ 2,171.3 | $ 1,764.8
Income before income taxes | 254.7 | 201.0 | 550.5 | 468.8
Net income | $ 190.8 | $ 146.8 | $ 427.4 | $ 369.3
Net income per share: |  |  |  |
Basic | $ 0.67 | $ 0.52 | $ 1.51 | $ 1.31
Diluted | $ 0.67 | $ 0.52 | $ 1.50 | $ 1.30
Weighted average number of shares outstanding: |  |  |  |
Basic | 279.4 | 277.2 | 279.0 | 277.1
Diluted | 280.4 | 278.2 | 280.0 | 278.4

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