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Deferred Policy Acquisition Costs (Tables) | 3 Months Ended
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Mar. 31, 2018
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 three months ended March 31, 2018 and 2017:
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
| ($ in millions)
Balance at the beginning of the period | $ | 294.3 |  |  | $ | 358.4 |
| Acquisition costs deferred | 116.4 |  |  | 122.8 |
| Amortization of deferred policy acquisition costs | (90.8 | ) |  | (113.7 | )
Balance at the end of the period | $ | 319.9 |  |  | $ | 367.5 |

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- Definition Tabular disclosure of the movement in deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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