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Business Combinations (Details) - USD ($)
3 Months Ended 8 Months Ended 12 Months Ended
Jan. 31, 2019
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Value of business acquired     $ 139,900,000 $ 0
Ozark National Life Insurance Company        
Business Acquisition [Line Items]        
Payments to acquire business $ 205,400,000      
Earn-out payment maximum 5,000,000.0      
Contingent consideration on businesses acquired 3,700,000   4,000,000.0  
Acquisition-related costs   $ 3,300,000   $ 1,000,000.0
Value of business acquired $ 145,800,000      
Revenues of acquiree since acquisition date     77,100,000  
Net earnings of acquiree since acquisition date     $ 11,700,000