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Other Assets - Affordable Housing and Other Tax Credit Investment Partnerships (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Affordable housing and other tax credit investment partnership interests |  |  |  |  |
Investment partnership interest | $ 240.7 |  | $ 240.7 |  | $ 206.9
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Other Assets |  | Other Assets |  | Other Assets
Amortization | $ 7.5 | $ 6.1 | $ 22.8 | $ 18.3 |
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 | 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) | Income Tax Expense (Benefit) |
Affordable housing tax credits and other benefits recognized | $ 9.6 | $ 8.0 | $ 28.9 | $ 23.1 |
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) | Income Tax Expense (Benefit) |
Other Liabilities | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Affordable housing and other tax credit investment partnership interests |  |  |  |  |
Unfunded commitments to fund low-income housing partnerships | $ 112.3 |  | $ 112.3 |  | $ 80.7

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