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Statutory Requirements and Dividends Restrictions (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Statutory Requirements and Dividends Restrictions | Actual and required statutory capital and surplus for the principal operating subsidiaries of the Company, excluding its Lloyd’s syndicate, as at December 31, 2017 and December 31, 2016 were estimated as follows:
|  | As at December 31, 2017
|  | U.S. |  | Bermuda |  | U.K.
|  | ($ in millions)
Required statutory capital and surplus |  | $ | 163.5 |  |  | $ | 1,146.7 |  |  | $ | 745.8 |
Statutory capital and surplus |  | $ | 645.5 |  |  | $ | 1,793.0 |  |  | $ | 888.6 |
|  | As at December 31, 2016
|  | U.S. |  | Bermuda |  | U.K.
|  | ($ in millions)
Required statutory capital and surplus |  | $ | 77.3 |  |  | $ | 1,259.4 |  |  | $ | 558.1 |
Statutory capital and surplus |  | $ | 598.3 |  |  | $ | 2,294.4 |  |  | $ | 970.3 |

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- Definition The entire disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -URI http://asc.fasb.org/subtopic&trid=4738323 + Details
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- References No definition available. + Details
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