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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
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

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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

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