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Deferred Policy Acquisition Costs (Tables) | 6 Months Ended
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Jun. 30, 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 three and six months ended June 30, 2017 and 2016:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
| ($ in millions) |  | ($ in millions)
Balance at the beginning of the period | $ | 367.5 |  |  | $ | 407.7 |  |  | $ | 358.4 |  |  | $ | 361.1 |
| Acquisition costs deferred | 93.4 |  |  | 128.1 |  |  | 216.2 |  |  | 304.9 |
| Amortization of deferred policy acquisition costs | (96.3 | ) |  | (126.7 | ) |  | (210.0 | ) |  | (256.9 | )
Balance at the end of the period | $ | 364.6 |  |  | $ | 409.1 |  |  | $ | 364.6 |  |  | $ | 409.1 |

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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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- References No definition available. + Details
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