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Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions |  |  |
Salaries and benefits | $ 263.1 | $ 282.1 | $ 164.9
Interest expense | 401.3 | 78.9 | 17.3
Acquisition related expenses | 0.0 | 118.9 | 11.6
Income before income tax | 336.8 | 257.1 | 247.8
Income tax benefit | 79.3 | 54.9 | 55.7
Net income | 257.5 | 202.2 | 192.1
Parent Company |  |  |
Condensed Financial Statements, Captions |  |  |
Dividends from subsidiaries | 360.0 | 360.0 | 160.0
Other interest income | 0.5 | 0.4 | 0.0
Other income, primarily management fees from subsidiaries | 51.6 | 51.7 | 41.3
Total income | 412.1 | 412.1 | 201.3
Salaries and benefits | 34.5 | 40.6 | 36.4
Interest expense | 18.4 | 12.6 | 8.2
Acquisition related expenses | 0.0 | 62.3 | 11.6
Other operating expenses, net | 22.5 | 25.0 | 17.6
Total expenses | 75.4 | 140.5 | 73.8
Income before income tax | 336.7 | 271.6 | 127.5
Income tax benefit | (4.2) | (18.9) | (7.6)
Income before undistributed earnings of subsidiaries | 340.9 | 290.5 | 135.1
Undistributed (loss) earnings of subsidiaries | (83.4) | (88.3) | 57.0
Net income | $ 257.5 | $ 202.2 | $ 192.1

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