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Employee Share-Based Incentive Compensation Plans (Under Qualified Retirement Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
One Beacon Employee Stock Ownership Plan |  |  |
Share-based compensation arrangement by share-based payment award |  |  |
Defined Contribution Plan, Cost Recognized | $ 5.5 | $ 5.7 | $ 4.4
Qualified Plan [Member] |  |  |
Share-based compensation arrangement by share-based payment award |  |  |
Eligible contribution percentage | 3.00% | 3.00% | 2.00%
Percentage of common shares outstanding | 3.00% | 3.00% |

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Represents the variable contribution amounts earned by eligible participants of the KSOP as a percentage of salary. + References No definition available. + Details
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- Definition Represents the percentage of total common shares outstanding owned by the plans. + References No definition available. + Details
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- Details
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- Details
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