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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Jul. 21, 2017 | Jan. 31, 2017 | Jun. 30, 2017 | Jan. 01, 2017 | Dec. 31, 2016 | Jan. 01, 2016
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, Change from purchase or sale of interests |  |  | $ 24.0 |  |  |  |
Parent company ownership in redeemable noncontrolling interest |  |  |  | 22.60% | 22.60% | 24.00% | 24.00%
Common Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common shares repurchased during period, Number of shares |  |  |  | 1,100 |  |  |
Common shares repurchased during period, Aggregate amount |  |  |  | $ 149.7 |  |  |
Common shares repurchased during period, Average cost (in dollars per share) |  |  |  | $ 142.33 |  |  |
Subsequent Event | DaVinciRe Holdings Ltd. |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, Change from purchase or sale of interests | $ 12.0 |  |  |  |  |  |
Parent company ownership in redeemable noncontrolling interest | 23.50% |  |  |  |  |  |
Subsequent Event | Common Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common shares repurchased during period, Number of shares |  | 15 |  |  |  |  |
Common shares repurchased during period, Aggregate amount |  | $ 2.1 |  |  |  |  |
Common shares repurchased during period, Average cost (in dollars per share) |  | $ 139.93 |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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