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Other Assets - Affordable Housing and Other Tax Credit Investment Partnerships (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |

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