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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Summary of the fair value and carrying value of financial instruments | The following table presents the fair value and carrying value of this financial instrument as of June 30, 2019 and December 31, 2018:
|  | June 30, 2019 |  | December 31, 2018
Millions |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
NSM Bank Facility |  | $ | 218.9 |  |  | $ | 218.0 |  |  | $ | 176.1 |  |  | $ | 176.6 |
MediaAlpha Bank Facility |  | $ | — |  |  | $ | — |  |  | $ | 14.6 |  |  | $ | 14.2 |
Other Operations debt |  | $ | 10.9 |  | (1) | $ | 10.8 |  | (1) | $ | — |  |  | $ | — |
(1) White Mountains measured the fair value of the Other Operations debt at the carrying value as a result of the debt being acquired as of March 12, 2019.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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