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Statutory Requirements and Dividends Restrictions - Summary of Statutory Requirements and Dividends Restrictions (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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U.S. |  |
Required statutory capital and surplus | $ 351.0 | $ 383.7
Actual statutory capital and surplus | 543.0 | 506.3
Bermuda |  |
Required statutory capital and surplus | 801.9 | 1,146.7
Actual statutory capital and surplus | 1,575.5 | 1,793.0
U.K. |  |
Required statutory capital and surplus | 772.1 | 745.8
Actual statutory capital and surplus | $ 857.9 | $ 888.6

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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://fasb.org/us-gaap/role/ref/legacyRef -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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