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Debt (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Jul. 23, 2015 | Dec. 31, 2014 | Nov. 25, 2014 | Oct. 10, 2014 | Aug. 14, 2013
Debt Instrument |  |  |  |  |  |  |  |
Total debt | $ 383,300,000 | $ 383,300,000 |  |  | $ 343,100,000 |  |  |
Repayments of Debt |  | 92,900,000 | $ 40,200,000 |  |  |  |  |
Draw down of debt and revolving line of credit |  | $ 134,000,000 | $ 40,000,000 |  |  |  |  |
WTM Bank Facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  |  |  | $ 425,000,000
Proceeds from Issuance of Debt | $ 60,000,000 |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 3.65% | 3.65% |  |  |  |  |  |
Repayments of Debt | $ 60,000,000 |  |  |  |  |  |  |
OB Bank Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility | 65,000,000 | $ 65,000,000 |  |  |  |  |  |
Other Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total debt | 0 | 0 |  |  | 1,000,000 |  |  |
OneBeacon | 2012 OBH Senior Notes |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Debt instrument at face value | 275,000,000 | 275,000,000 |  |  | 275,000,000 |  |  |
Unamortized original issue discount | (200,000) | (200,000) |  |  | (300,000) |  |  |
Total debt | 274,800,000 | 274,800,000 |  |  | 274,700,000 |  |  |
White Mountains | WTM Bank Facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total debt | 0 | 0 |  |  | 0 |  |  |
Tranzact [Member] | Tranzact Bank Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long-term Line of Credit | 95,800,000 | 95,800,000 |  |  | 68,700,000 |  |  |
Unamortized Debt Issuance Expense | (2,000,000) | (2,000,000) |  |  | (1,300,000) |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 93,800,000 | 93,800,000 |  |  | 67,400,000 |  |  |
Total commitment under revolving credit facility | 116,000,000 | 116,000,000 |  |  |  |  |  |
Notional amount | 101,000,000 | 101,000,000 |  |  |  |  | $ 70,000,000 |
Line of Credit Facility, Remaining Borrowing Capacity | 15,000,000 | 15,000,000 |  |  |  |  |  |
Proceeds from Long-term Lines of Credit |  | 13,000,000 |  |  |  |  |  |
Repayments of Debt | 1,300,000 | 3,900,000 |  |  |  |  |  |
MediaAlpha | MediaAlpha Bank Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long-term Line of Credit | 15,000,000 | 15,000,000 |  |  | 0 |  |  |
Unamortized Debt Issuance Expense | (300,000) | (300,000) |  |  | 0 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 14,700,000 | 14,700,000 |  |  | $ 0 |  |  |
Total commitment under revolving credit facility |  |  |  | $ 20,000,000 |  |  |  |
Notional amount | 15,000,000 | 15,000,000 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 5,000,000 | 5,000,000 |  |  |  |  |  |
Nordea Bank Finland |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | $ 125,000,000.0 |  |
Lloyds Bank plc [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | 75,000,000.0 |  |
Unsecured Debt [Member] | Nordea Bank Finland |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | 100,000,000.0 |  |
Unsecured Debt [Member] | Lloyds Bank plc [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  | $ 25,000,000.0 |  |
TruBridge [Member] | Tranzact [Member] | Tranzact Bank Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Notional amount | $ 31,000,000 | $ 31,000,000 |  |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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