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Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions      
Salaries and benefits $ 270.9 $ 263.1 $ 282.1
Interest expense 480.9 401.3 78.9
Acquisition related expenses 0.0 0.0 118.9
Income before income tax 294.5 336.8 257.1
Income tax benefit 68.5 79.3 54.9
Net income 226.0 257.5 202.2
Parent Company      
Condensed Financial Statements, Captions      
Dividends from subsidiaries 205.0 360.0 360.0
Other interest income 0.4 0.5 0.4
Other income, primarily management fees from subsidiaries 54.3 51.6 51.7
Total income 259.7 412.1 412.1
Salaries and benefits 43.6 34.5 40.6
Interest expense 18.6 18.4 12.6
Acquisition related expenses 0.0 0.0 62.3
Other operating expenses, net 27.8 22.5 25.0
Total expenses 90.0 75.4 140.5
Income before income tax 169.7 336.7 271.6
Income tax benefit (7.2) (4.2) (18.9)
Income before undistributed earnings of subsidiaries 176.9 340.9 290.5
Undistributed (loss) earnings of subsidiaries 49.1 (83.4) (88.3)
Net income $ 226.0 $ 257.5 $ 202.2