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Subsequent Events (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2017 | Jul. 31, 2017 | Jan. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Jul. 01, 2017 | Jan. 01, 2017 | Jan. 01, 2016
DaVinciRe Holdings Ltd. |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, change from purchase or sale of interests |  | $ 12.0 | $ 24.0 |  |  |  |  |
Parent company ownership in redeemable noncontrolling interest |  |  |  | 23.50% | 24.00% | 23.50% | 22.60% | 24.00%
DaVinciRe Holdings Ltd. | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity to third party investors | $ 248.6 |  |  |  |  |  |  |
Noncontrolling interest, change from purchase or sale of interests | $ 49.7 |  |  |  |  |  |  |
Parent company ownership in redeemable noncontrolling interest | 22.10% |  |  |  |  |  |  |
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  | 10.10% | 28.80% |  |  |
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Preference Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity to third party investors |  |  |  | $ 134.1 | $ 166.6 |  |  |
Contributions to subsidiaries |  |  |  | $ 9.5 | $ 55.2 |  |  |
Upsilon RFO Re Ltd. | Subsequent Event | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage | 16.00% |  |  |  |  |  |  |
Upsilon RFO Re Ltd. | Subsequent Event | Variable Interest Entity, Primary Beneficiary | Preference Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity to third party investors | $ 46.5 |  |  |  |  |  |  |
Contributions to subsidiaries | $ 17.7 |  |  |  |  |  |  |

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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 + Details
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