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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On July 1, 2017, the Company completed its previously announced acquisition of AIG United Guaranty Insurance (Asia) Limited following the payment of $40.0 million to AIG. The Company plans to operate such operation as Arch MI Asia Limited. This acquisition adds to the Company’s existing private mortgage insurance businesses, which have operations in the United States, Europe and Australia.