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Basis of Presentation Purchase of CIC (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Purchase of CIC [Abstract]  
Statutory capital and surplus of acquisition $ 47.6
Net cash payment to acquire business 5.8
Cash Acquired from Acquisition 37.3
Noncash or Part Noncash Acquisition, Investments Acquired 10.3
Finite-lived Intangible Assets Acquired 5.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 6.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 6.8
Business Combination, Consideration Transferred, Liabilities Incurred 48.3
Business Combination, Consideration Transferred 48.3
Business Combination, Consideration Transferred, Other $ 0.0