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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss):
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2024 | $ | (0.3) |  |  | $ | (14.1) |  |  | $ | 59.3 |  |  | $ | (150.4) |  |  | $ | (105.5) |
Other comprehensive income (loss) before reclassifications and income tax benefit (expense) | 0.3 |  |  | (1.2) |  |  | — |  |  | 162.4 |  |  | 161.5 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (0.2) |  |  | (3.1) |  |  | — |  |  | (3.3) |
Income tax benefit (expense) | (0.1) |  |  | 0.3 |  |  | 0.9 |  |  | (10.4) |  |  | (9.3) |
Net current period other comprehensive income (loss) | 0.2 |  |  | (1.1) |  |  | (2.2) |  |  | 152.0 |  |  | 148.9 |
Balance at September 30, 2025 | $ | (0.1) |  |  | $ | (15.2) |  |  | $ | 57.1 |  |  | $ | 1.6 |  |  | $ | 43.4 |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2023 | $ | (0.4) |  |  | $ | (23.4) |  |  | $ | 62.0 |  |  | $ | (93.8) |  |  | $ | (55.6) |
Other comprehensive income (loss) before reclassifications and income tax benefit (expense) | 0.6 |  |  | (5.9) |  |  | — |  |  | 54.8 |  |  | 49.5 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 0.1 |  |  | (2.7) |  |  | — |  |  | (2.6) |
Income tax benefit (expense) | (0.2) |  |  | 1.5 |  |  | 0.7 |  |  | (4.2) |  |  | (2.2) |
Net current period other comprehensive income (loss) | 0.4 |  |  | (4.3) |  |  | (2.0) |  |  | 50.6 |  |  | 44.7 |
Balance at September 30, 2024 | $ | — |  |  | $ | (27.7) |  |  | $ | 60.0 |  |  | $ | (43.2) |  |  | $ | (10.9) |

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