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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Note 18. Subsequent Events COVID-19 On January 30, 2020, the spread of novel coronavirus (“COVID-19”) was declared a Public Health Emergency of International Concern by the World Health Organization (“WHO”). Subsequently, on March 11, 2020, the WHO characterized the COVID-19 outbreak as a pandemic. White Mountains continues to monitor the impact of the COVID-19 pandemic but, as the pandemic is ongoing, White Mountains cannot determine the ultimate impact it may have on the global financial markets, the overall economy and on White Mountains’s businesses, results of operations and financial condition.