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Other Assets - Affordable Housing and Other Tax Credit Investment Partnerships (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Affordable housing and other tax credit investment partnership interests      
Investment partnership interest $ 235.5 $ 206.9  
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets  
Amortization $ 27.9 $ 23.5 $ 24.4
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit)
Affordable housing tax credits and other benefits recognized $ 38.1 $ 31.1 $ 26.9
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit)
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Unfunded commitments to fund low-income housing partnerships $ 98.7 $ 80.7