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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 175.3 | $ 155.5 | $ 129.0 | $ 433.6 | $ 6.0 | $ 198.7 | $ 122.3 | $ 42.1 | $ 893.4 | $ 369.1 | $ 373.8
Expenses | 118.8 | 104.4 | 113.2 | 151.9 | 150.1 | 154.4 | 134.7 | 108.1 | 488.3 | 547.3 | 366.0
Pre-tax income (loss) | 56.5 | 51.1 | 15.8 | 281.7 | (144.1) | 44.3 | (12.4) | (66.0) | 405.1 | (178.2) | 7.8
Tax (expense) benefit | (10.4) | (8.8) | 0.1 | (10.2) | 3.6 | 3.6 | (2.5) | (0.7) | (29.3) | 4.0 | 7.8
Net income (loss) from continuing operations | 46.1 | 42.3 | 15.9 | 271.5 | (140.5) | 47.9 | (14.9) | (66.7) | 375.8 | (174.2) | 15.6
Net income from discontinued operations, net of tax | (0.8) | 0.9 | 0.0 | 0.7 | 0.0 | (17.3) | 0.0 | 0.1 | 0.0 | 0.0 | 20.5
Non-controlling interest in consolidated subsidiaries | 15.6 | 5.5 | 4.6 | 12.2 | 3.0 | 10.2 | 18.4 | 18.6 | 37.9 | 50.2 | 34.1
Net income attributable to White Mountains’s common shareholders | $ 60.9 | $ 48.7 | $ 20.5 | $ 284.4 | $ (137.5) | $ 40.8 | $ 3.5 | $ (48.0) | $ 414.5 | $ (141.2) | $ 627.2
Basic earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 19.37 | $ 15.01 | $ 6.44 | $ 89.42 | $ (43.24) | $ 18.27 | $ 1.02 | $ (12.85) | $ 130.02 | $ (36.67) | $ 11.56
Discontinued operations | (0.25) | 0.28 | 0 | 0.22 | 0 | (5.44) | 0 | 0.03 | 0.25 | (5.09) | 134.50
Total consolidated operations | 19.12 | 15.29 | 6.44 | 89.64 | (43.24) | 12.83 | 1.02 | (12.82) | 130.27 | (41.76) | 146.06
Diluted earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Continuing operations | 19.37 | 15.01 | 6.44 | 89.42 | (43.24) | 18.27 | 1.02 | (12.85) | 130.02 | (36.67) | 11.56
Discontinued operations | (0.25) | 0.28 | 0 | 0.22 | 0 | (5.44) | 0 | 0.03 | 0.25 | (5.09) | 134.50
Total consolidated operations | $ 19.12 | $ 15.29 | $ 6.44 | $ 89.64 | $ (43.24) | $ 12.83 | $ 1.02 | $ (12.82) | $ 130.27 | $ (41.76) | $ 146.06

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