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Deferred Policy Acquisition Costs (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Reconciliation of beginning and ending deferred policy acquisition costs | The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the twelve months ended December 31, 2017 and 2016:
|  |  | Twelve Months Ended December 31, 2017 |  | Twelve Months Ended December 31, 2016
|  | ($ in millions)
Balance at the beginning of the period |  | $ | 358.4 |  |  | $ | 361.1 |
| Acquisition costs deferred |  | 336.4 |  |  | 526.2 |
| Amortization of deferred policy acquisition costs |  | (400.5 | ) |  | (528.9 | )
Balance at the end of the period |  | $ | 294.3 |  |  | $ | 358.4 |

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