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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2022 | $ | (0.9) |  |  | $ | (22.8) |  |  | $ | 64.7 |  |  | $ | (174.3) |  |  | $ | (133.3) |
Other comprehensive income before reclassifications and income tax benefit (expense) | 0.6 |  |  | (0.9) |  |  | — |  |  | 70.8 |  |  | 70.5 |
Reclassification adjustment for loss included in net income | — |  |  | — |  |  | — |  |  | 9.7 |  |  | 9.7 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 0.1 |  |  | (3.6) |  |  | — |  |  | (3.5) |
Income tax benefit (expense) | (0.1) |  |  | 0.2 |  |  | 0.9 |  |  | — |  |  | 1.0 |
Net current period other comprehensive income | 0.5 |  |  | (0.6) |  |  | (2.7) |  |  | 80.5 |  |  | 77.7 |
Balance at December 31, 2023 | $ | (0.4) |  |  | $ | (23.4) |  |  | $ | 62.0 |  |  | $ | (93.8) |  |  | $ | (55.6) |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2021 | $ | 1.1 |  |  | $ | (34.8) |  |  | $ | 66.1 |  |  | $ | 21.1 |  |  | $ | 53.5 |
Other comprehensive income before reclassifications and income tax benefit (expense) | (2.7) |  |  | 14.9 |  |  | — |  |  | (195.4) |  |  | (183.2) |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 1.2 |  |  | (1.9) |  |  | — |  |  | (0.7) |
Income tax benefit (expense) | 0.7 |  |  | (4.1) |  |  | 0.5 |  |  | — |  |  | (2.9) |
Net current period other comprehensive income | (2.0) |  |  | 12.0 |  |  | (1.4) |  |  | (195.4) |  |  | (186.8) |
Balance at December 31, 2022 | $ | (0.9) |  |  | $ | (22.8) |  |  | $ | 64.7 |  |  | $ | (174.3) |  |  | $ | (133.3) |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2020 | $ | 1.6 |  |  | $ | (57.1) |  |  | $ | 67.0 |  |  | $ | 123.4 |  |  | $ | 134.9 |
Other comprehensive income before reclassifications and income tax benefit (expense) | (1.0) |  |  | 25.5 |  |  | — |  |  | (62.0) |  |  | (37.5) |
Amounts reclassified from accumulated other comprehensive income | 0.3 |  |  | 4.4 |  |  | (1.2) |  |  | (40.3) |  |  | (36.8) |
Income tax benefit (expense) | 0.2 |  |  | (7.6) |  |  | 0.3 |  |  | — |  |  | (7.1) |
Net current period other comprehensive income | (0.5) |  |  | 22.3 |  |  | (0.9) |  |  | (102.3) |  |  | (81.4) |
Balance at December 31, 2021 | $ | 1.1 |  |  | $ | (34.8) |  |  | $ | 66.1 |  |  | $ | 21.1 |  |  | $ | 53.5 |

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