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Debt (Tables) | 9 Months Ended
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Sep. 30, 2016
Debt Disclosure [Abstract] |
Schedule of debt outstanding | White Mountains’s debt outstanding as of September 30, 2016 and December 31, 2015 consisted of the following:
Millions |  | September 30, 2016 |  | Effective Rate (1) |  | December 31, 2015 |  | Effective Rate (1)
WTM Bank Facility |  | $ | — |  |  | N/A |  | $ | 50.0 |  |  | 3.9%
OBH Senior Notes, at face value |  | 275.0 |  |  | 4.7% |  | 275.0 |  |  | 4.7%
Unamortized original issue discount and debt issuance costs |  | (1.9 | ) |  |  |  | (2.1 | ) |  |
OBH Senior Notes, carrying value |  | 273.1 |  |  |  |  | 272.9 |  |  |
OneBeacon Bank Facility |  | — |  |  | N/A |  | — |  |  | N/A
MediaAlpha Bank Facility |  | 15.6 |  |  | 5.8% |  | 15.0 |  |  | 5.5%
Unamortized issuance cost |  | (.2 | ) |  |  |  | (.3 | ) |  |
MediaAlpha Bank Facility, carrying value |  | 15.4 |  |  |  |  | 14.7 |  |  |
Total debt |  | $ | 288.5 |  |  |  |  | $ | 337.6 |  |  |
(1) Effective rate considers the effect of the debt issuance costs.

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