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Common Shareholders’ Equity and Non-controlling Interests | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Common Shareholder's Equity | Common Shareholders’ Equity and Non-controlling Interests Common Shares Repurchased and Retired During the past several years, White Mountains’s board of directors authorized the Company to repurchase its common shares, from time to time, subject to market conditions. Shares may be repurchased on the open market or through privately negotiated transactions. The repurchase authorizations do not have a stated expiration date. As of December 31, 2017, White Mountains may repurchase an additional 643,130 shares under these board authorizations. In addition, from time to time White Mountains has also repurchased its common shares through tender offers that were separately approved by its board of directors. During 2017, the Company repurchased 832,725 common shares for $723.9 million at an average share price of $869, which were comprised of 821,732 common shares repurchased under the board authorization for $713.1 million at an average share price of $870 and 10,993 common shares repurchased pursuant to employee benefit plans. Shares repurchased pursuant to employee benefit plans do not fall under the board authorizations referred to above. During 2016, the Company repurchased 1,106,145 common shares for $887.2 million at an average share price of $802, which were comprised of 1,098,123 common shares repurchased under the board authorization for $881.4 million at an average share price of $803 and 8,022 common shares repurchased pursuant to employee benefit plans. During 2015, the Company repurchased 387,495 common shares for $284.2 million at an average share price of $733, which were comprised of 361,839 common shares repurchased under the board authorization for $267.4 million at an average share price of $739 and 10,802 common shares repurchased pursuant to employee benefit plans. Common Shares Issued During 2017, the Company issued a total of 25,086 common shares, which consisted of 17,985 restricted shares to key personnel, 5,142 shares issued to the Company’s retired CEO as a result of exercised options, and 1,959 shares issued to directors of the Company. During 2016, the Company issued a total of 47,030 common shares, which consisted of 25,365 restricted shares to key personnel, 14,930 shares issued to the Company’s retired CEO as a result of exercised options, 5,000 shares issued in satisfaction of performance shares and 1,735 shares issued to directors of the Company. During 2015, the Company issued a total of 25,016 common shares, which consisted of 23,640 restricted shares issued to key personnel and 1,376 shares issued to directors of the Company. Dividends on Common Shares For the years ended December 31, 2017, 2016 and 2015, the Company declared and paid cash dividends totaling $4.6 million, $5.4 million and $6.0 million (or $1.00 per common share). Non-controlling Interests Non-controlling interests consist of the ownership interests of non-controlling shareholders in consolidated entities and are presented separately on the balance sheet. The following table presents the balance of non-controlling interests included in White Mountains’s total equity and the related percentage of each consolidated entity’s total equity owned by non-controlling shareholders as of December 31, 2017 and 2016:
|  | December 31, 2017 |  | December 31, 2016
$ in millions |  | Non-controlling Percentage |  | Non-controlling Equity |  | Non-controlling Percentage |  | Non-controlling Equity
OneBeacon |  | — | % |  | $ | — |  |  | 23.9 | % |  | $ | 244.6 |
Other, excluding mutuals and reciprocals |  |  |  |  |  |  |  |
HG Global |  | 3.1 |  |  | 15.9 |  |  | 3.1 |  |  | 16.6 |
MediaAlpha |  | 35.7 |  |  | 13.1 |  |  | 40.0 |  |  | 11.7 |
Dewar (1) |  | — |  |  | — |  |  | 18.8 |  |  | 3.9 |
Buzzmove |  | 22.9 |  |  | 2.5 |  |  | 29.1 |  |  | 3.0 |
Total other, excluding mutuals and reciprocals |  |  |  | 31.5 |  |  |  |  | 35.2 |
Mutuals and reciprocals |  |  |  |  |  |  |  |
BAM |  | 100.0 |  |  | (163.2 | ) |  | 100.0 |  |  | (150.9 | )
SSIE |  | — |  |  | — |  |  | 100.0 |  |  | 4.4 |
Total mutuals and reciprocals |  |  |  | (163.2 | ) |  |  |  | (146.5 | )
Total non-controlling interests |  |  |  | $ | (131.7 | ) |  |  |  | $ | 133.3 |
(1) Dewar is a subsidiary of OneBeacon.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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