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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Embrace On April 1, 2019, NSM acquired 100% of Embrace Pet Insurance, a nationwide provider of pet health insurance for dogs and cats. NSM paid $73.0 million of cash consideration, net of cash acquired, for its equity interest in Embrace Pet Insurance. Kudu On April 4, 2019, White Mountains completed its acquisition of Oaktree’s interests in Kudu for $81.4 million. As a result of the purchase, White Mountains’s ownership interest was increased to 99.1% of the basic units outstanding of Kudu (85.4% on a fully diluted, fully converted basis). In connection with the transaction, White Mountains assumed all of Oaktree’s unfunded capital commitments to Kudu, increasing White Mountains’s total unfunded Kudu capital commitment to $104.7 million.