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Segment Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting [Abstract] |  |
Financial information for White Mountains' segments | he following tables present the financial information for White Mountains’s segments:
Millions |  | HG Global/BAM (1) |  | MediaAlpha |  | Other Operations |  | Total
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | $ | 9.4 |  |  | $ | — |  |  | $ | 1.0 |  |  | $ | 10.4 |
Net investment income |  | 12.3 |  |  | — |  |  | 43.7 |  |  | 56.0 |
Net realized and unrealized investment gains |  | .6 |  |  | — |  |  | 132.7 |  |  | 133.3 |
Advertising and commission revenues (2) |  | — |  |  | 163.2 |  |  | 3.8 |  |  | 167.0 |
Other revenues |  | 1.0 |  |  | — |  |  | 6.1 |  |  | 7.1 |
Total revenues |  | 23.3 |  |  | 163.2 |  |  | 187.3 |  |  | 373.8 |
Losses and LAE |  | — |  |  | — |  |  | 1.1 |  |  | 1.1 |
Insurance acquisition expenses |  | 4.0 |  |  | — |  |  | .1 |  |  | 4.1 |
Other underwriting expenses |  | .4 |  |  | — |  |  | — |  |  | .4 |
Cost of sales |  | — |  |  | 135.9 |  |  | 3.5 |  |  | 139.4 |
General and administrative expenses |  | 42.9 |  |  | 26.7 |  |  | 149.1 |  |  | 218.7 |
Interest expense |  | — |  |  | 1.0 |  |  | 1.3 |  |  | 2.3 |
Total expenses |  | 47.3 |  |  | 163.6 |  |  | 155.1 |  |  | 366.0 |
Pre-tax (loss) income |  | $ | (24.0 | ) |  | $ | (.4 | ) |  | $ | 32.2 |  |  | $ | 7.8 |
(1) | BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.
(2) | Approximately 27% of MediaAlpha’s advertising revenue was associated with one customer for the years ended December 31, 2017.
Millions |  | HG Global/BAM (1) |  | MediaAlpha |  | Other Operations |  | Total
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | $ | 5.9 |  |  | $ | — |  |  | $ | 7.5 |  |  | $ | 13.4 |
Net investment income |  | 9.0 |  |  | — |  |  | 23.1 |  |  | 32.1 |
Net realized and unrealized investment gains (losses) |  | .7 |  |  | — |  |  | (28.1 | ) |  | (27.4 | )
Advertising and commission revenues (2) |  | — |  |  | 116.5 |  |  | 1.8 |  |  | 118.3 |
Other revenues |  | 1.1 |  |  | — |  |  | 20.2 |  |  | 21.3 |
Total revenues |  | 16.7 |  |  | 116.5 |  |  | 24.5 |  |  | 157.7 |
Losses and LAE |  | — |  |  | — |  |  | 8.0 |  |  | 8.0 |
Insurance acquisition expenses |  | 3.4 |  |  | — |  |  | 2.2 |  |  | 5.6 |
Other underwriting expenses |  | .4 |  |  | — |  |  | — |  |  | .4 |
Cost of sales |  | — |  |  | 97.8 |  |  | 4.2 |  |  | 102.0 |
General and administrative expenses |  | 39.6 |  |  | 21.9 |  |  | 124.5 |  |  | 186.0 |
Interest expense |  | — |  |  | .9 |  |  | 2.1 |  |  | 3.0 |
Total expenses |  | 43.4 |  |  | 120.6 |  |  | 141.0 |  |  | 305.0 |
Pre-tax loss |  | $ | (26.7 | ) |  | $ | (4.1 | ) |  | $ | (116.5 | ) |  | $ | (147.3 | )
(1) | BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.
(2) | Approximately 24% of MediaAlpha’s advertising revenue was associated with one customer for the years ended December 31, 2016.
Millions |  | HG Global/BAM (1) |  | MediaAlpha |  | Other Operations |  | Total
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | $ | 3.3 |  |  | $ | — |  |  | $ | 8.7 |  |  | $ | 12.0 |
Net investment income |  | 6.1 |  |  | — |  |  | 4.8 |  |  | 10.9 |
Net realized and unrealized investment gains |  | .6 |  |  | — |  |  | 259.9 |  | (2) | 260.5 |
Advertising and commission revenues (3) |  | — |  |  | 105.5 |  |  | 1.9 |  |  | 107.4 |
Other revenues |  | .7 |  |  | — |  |  | 48.5 |  |  | 49.2 |
Total revenues |  | 10.7 |  |  | 105.5 |  |  | 323.8 |  |  | 440.0 |
Losses and LAE |  | — |  |  | — |  |  | 8.2 |  |  | 8.2 |
Insurance acquisition expenses |  | 2.9 |  |  | — |  |  | 3.4 |  |  | 6.3 |
Other underwriting expenses |  | .4 |  |  | — |  |  | — |  |  | .4 |
Cost of sales |  | — |  |  | 90.7 |  |  | 2.9 |  |  | 93.6 |
General and administrative expenses |  | 36.8 |  |  | 16.4 |  |  | 147.5 |  |  | 200.7 |
Interest expense |  | — |  |  | .4 |  |  | 1.2 |  |  | 1.6 |
Total expenses |  | 40.1 |  |  | 107.5 |  |  | 163.2 |  |  | 310.8 |
Pre-tax (loss) income |  | $ | (29.4 | ) |  | $ | (2.0 | ) |  | $ | 160.6 |  |  | $ | 129.2 |
(1) | BAM manages its affairs on a statutory accounting basis. BAM’s statutory surplus includes the BAM Surplus Notes and is not reduced by accruals of interest expense on the BAM Surplus Notes. BAM’s statutory surplus is reduced only after a payment of principal or interest has been approved by the NYDFS.
(2) | Net realized and unrealized investment gains in the Other Operations segment includes the unrealized investment gain of $258.8 related to the investment in Symetra common shares, representing the difference between the carrying value under the equity method at November 5, 2015 and the fair value at December 31, 2015. See Note 14 — “Investments in Unconsolidated Affiliates”.
(3) | Approximately 52% of MediaAlpha’s advertising revenue was associated with three customers for the year ended December 31, 2015.
Selected Balance Sheet Data Millions |  | HG Global/BAM |  | MediaAlpha |  | Other Operations |  | Eliminations |  | Held for Sale |  | Total
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 693.4 |  |  | $ | — |  |  | $ | 2,687.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,380.7 |
Total assets |  | 747.4 |  | (1) | 96.5 |  |  | 3,039.9 |  |  | (227.9 | ) |  | 3.3 |  |  | 3,659.2 |
Total liabilities |  | 394.9 |  |  | 59.8 |  |  | 71.6 |  |  | (227.9 | ) |  | — |  |  | 298.4 |
Total White Mountains’s common shareholders’ equity |  | 499.8 |  |  | 23.6 |  |  | 2,965.8 |  |  | — |  |  | 3.3 |  |  | 3,492.5 |
Non-controlling interest |  | (147.3 | ) |  | 13.1 |  |  | 2.5 |  |  | — |  |  | — |  |  | (131.7 | )
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 629.7 |  |  | $ | — |  |  | $ | 2,084.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,714.4 |
Assets held for sale |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,606.4 |  |  | 3,606.4 |
Total assets |  | 677.6 |  | (1) | 57.6 |  |  | 2,358.8 |  |  | (180.2 | ) |  | 3,606.4 |  |  | 6,520.2 |
Liabilities held for sale |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,569.3 |  |  | 2,569.3 |
Total liabilities |  | 289.1 |  |  | 28.3 |  |  | 97.7 |  |  | (180.2 | ) |  | 2,569.3 |  |  | 2,804.2 |
Total White Mountains’s common shareholders’ equity |  | 522.8 |  |  | 17.6 |  |  | 2,258.1 |  |  | — |  |  | 784.2 |  |  | 3,582.7 |
Non-controlling interest |  | (134.3 | ) |  | 11.7 |  |  | 3.0 |  |  | — |  |  | 252.9 |  |  | 133.3 |
Schedule of selected balance sheet data by segment |  |
Selected Balance Sheet Data Millions |  | HG Global/BAM |  | MediaAlpha |  | Other Operations |  | Eliminations |  | Held for Sale |  | Total
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 693.4 |  |  | $ | — |  |  | $ | 2,687.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,380.7 |
Total assets |  | 747.4 |  | (1) | 96.5 |  |  | 3,039.9 |  |  | (227.9 | ) |  | 3.3 |  |  | 3,659.2 |
Total liabilities |  | 394.9 |  |  | 59.8 |  |  | 71.6 |  |  | (227.9 | ) |  | — |  |  | 298.4 |
Total White Mountains’s common shareholders’ equity |  | 499.8 |  |  | 23.6 |  |  | 2,965.8 |  |  | — |  |  | 3.3 |  |  | 3,492.5 |
Non-controlling interest |  | (147.3 | ) |  | 13.1 |  |  | 2.5 |  |  | — |  |  | — |  |  | (131.7 | )
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investments |  | $ | 629.7 |  |  | $ | — |  |  | $ | 2,084.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,714.4 |
Assets held for sale |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,606.4 |  |  | 3,606.4 |
Total assets |  | 677.6 |  | (1) | 57.6 |  |  | 2,358.8 |  |  | (180.2 | ) |  | 3,606.4 |  |  | 6,520.2 |
Liabilities held for sale |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,569.3 |  |  | 2,569.3 |
Total liabilities |  | 289.1 |  |  | 28.3 |  |  | 97.7 |  |  | (180.2 | ) |  | 2,569.3 |  |  | 2,804.2 |
Total White Mountains’s common shareholders’ equity |  | 522.8 |  |  | 17.6 |  |  | 2,258.1 |  |  | — |  |  | 784.2 |  |  | 3,582.7 |
Non-controlling interest |  | (134.3 | ) |  | 11.7 |  |  | 3.0 |  |  | — |  |  | 252.9 |  |  | 133.3 |
(1) | As of December 2017 and 2016, BAM’s total assets reflect the elimination of $499.0 and $503.0 of BAM Surplus Notes issued to HG Global and its subsidiaries, and $126.0 and $108.0 in accrued interest related to the BAM Surplus Notes.

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