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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 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 |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2019 | $ | 0.8 |  |  | $ | (55.1) |  |  | $ | 69.0 |  |  | $ | (11.3) |  |  | $ | 3.4 |
Other comprehensive income before reclassifications and income tax benefit (expense) | 1.1 |  |  | (7.4) |  |  | — |  |  | 134.3 |  |  | 128.0 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 4.7 |  |  | (2.7) |  |  | 0.4 |  |  | 2.4 |
Income tax benefit (expense) | (0.3) |  |  | 0.7 |  |  | 0.7 |  |  | — |  |  | 1.1 |
Net current period other comprehensive income | 0.8 |  |  | (2.0) |  |  | (2.0) |  |  | 134.7 |  |  | 131.5 |
Balance at December 31, 2020 | $ | 1.6 |  |  | $ | (57.1) |  |  | $ | 67.0 |  |  | $ | 123.4 |  |  | $ | 134.9 |

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