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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Note 20. Subsequent Events On July 21, 2016, White Mountains closed its previously announced sale of Tranzact Holdings, LLC to an affiliate of Clayton, Dubilier & Rice, LLC. White Mountains received net proceeds of $221.3 million from the sale.