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Subsequent Events
12 Months Ended
Dec. 31, 2019
Subsequent Events [Abstract]  
Subsequent Events Subsequent Events
On February 20, 2020, ProAssurance entered into a definitive agreement to acquire NORCAL Group (NORCAL), an underwriter of medical professional liability insurance, after the demutualization of NORCAL Mutual Insurance Company (NORCAL Mutual), NORCAL's ultimate controlling party. ProAssurance will pay base consideration of $450 million to be funded with cash and debt, with contingent consideration of up to $150 million should NORCAL reserves as of the acquisition date develop favorably to estimates made by ProAssurance. The demutualization and the definitive agreement are mutually contingent, and are subject to customary conditions, including approval by NORCAL Mutual policyholders and appropriate state and federal regulators. The companies are targeting to close the transaction by the end of 2020.