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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2017
Reinsurance Disclosures [Abstract] |
Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses | The effect of assumed and ceded reinsurance on premiums written, premiums earned and insurance losses and loss adjustment expenses for the twelve months ended December 31, 2017, 2016 and 2015 was as follows:
|  | Twelve Months Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | ($ in millions)
Premiums written: |  |  |  |  |  |
Direct |  | $ | 1,812.4 |  |  | $ | 1,733.8 |  |  | $ | 1,748.4 |
Assumed |  | 1,548.5 |  |  | 1,413.2 |  |  | 1,248.9 |
Ceded |  | (1,148.4 | ) |  | (553.3 | ) |  | (351.1 | )
Net premiums written |  | $ | 2,212.5 |  |  | $ | 2,593.7 |  |  | $ | 2,646.2 |
Premiums earned: |  |  |  |  |  |  |  |  |
Direct |  | $ | 1,757.4 |  |  | $ | 1,768.4 |  |  | $ | 1,703.3 |
Assumed |  | 1,451.8 |  |  | 1,317.9 |  |  | 1,153.5 |
Ceded |  | (902.6 | ) |  | (449.0 | ) |  | (383.5 | )
Net premiums earned |  | $ | 2,306.6 |  |  | $ | 2,637.3 |  |  | $ | 2,473.3 |
Insurance losses and loss adjustment expenses: |  |  |  |  |  |  |  |  |
Direct |  | $ | 1,673.6 |  |  | $ | 1,091.9 |  |  | $ | 980.6 |
Assumed |  | 1,399.9 |  |  | 699.6 |  |  | 493.0 |
Ceded |  | (1,078.8 | ) |  | (215.4 | ) |  | (107.4 | )
Net insurance losses and loss adjustment expenses |  | $ | 1,994.7 |  |  | $ | 1,576.1 |  |  | $ | 1,366.2 |

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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- References No definition available. + Details
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