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Deferred Policy Acquisition Costs (Tables) | 12 Months Ended
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Dec. 31, 2023
Insurance [Abstract] |
Reconciliation of beginning and ending deferred policy acquisition costs |
| Twelve Months Ended December 31, 2023 |  | Twelve Months Ended December 31, 2022
| ($ in millions)
Balance at the beginning of the period | $ | 319.0 |  |  | $ | 290.8 |
Acquisition costs deferred | 357.4 |  |  | 460.0 |
Amortization of deferred acquisition costs | (380.2) |  |  | (431.8) |
Balance at the end of the period | $ | 296.2 |  |  | $ | 319.0 |

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