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Statutory Requirements and Dividends Restrictions - Summary of Statutory Requirements and Dividends Restrictions (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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U.S. |  |
Required statutory capital and surplus | $ 163.5 | $ 77.3
Statutory capital and surplus | 645.5 | 598.3
Bermuda |  |
Required statutory capital and surplus | 1,146.7 | 1,259.4
Statutory capital and surplus | 1,793.0 | 2,294.4
U.K. |  |
Required statutory capital and surplus | 745.8 | 558.1
Statutory capital and surplus | $ 888.6 | $ 970.3

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- Definition Dividend payments restrictions schedule required statutory capital and surplus. + References No definition available. + Details
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- Definition Amount of statutory capital and surplus computed using prescribed or permitted statutory accounting practice. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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