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Insurance Operations (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Summary of Reconciliations of Direct to Net premiums on Written and Earned Basis Related to Wholly Owned Underwriting Enterprise Subsidiary | Reconciliations of direct to net premiums, on a written and earned basis, for 2017, 2016 and 2015 related to the wholly-owned underwriting enterprise subsidiary discussed above are as follows (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Written |  |  | Earned |  |  | Written |  |  | Earned |  |  | Written |  |  | Earned |
Direct |  | $ | 60.7 |  |  | $ | 60.4 |  |  | $ | 71.8 |  |  | $ | 69.6 |  |  | $ | 71.5 |  |  | $ | 71.7 |
Assumed |  |  | 5.0 |  |  |  | 4.5 |  |  |  | 5.2 |  |  |  | 4.9 |  |  |  | 4.4 |  |  |  | 5.1 |
Ceded |  |  | (65.7 | ) |  |  | (64.9 | ) |  |  | (77.0 | ) |  |  | (74.5 | ) |  |  | (75.9 | ) |  |  | (76.8 | )
Net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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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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