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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
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

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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

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