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Fair Value Measurements Fair Value, Balance Sheet Grouping (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans, Gross, Insurance Policy $ 301.4 $ 300.6  
Short-term Investments at Cost which Approximates Fair Value 350.4 286.1  
Cash and Cash Equivalents, Fair Value Disclosure 350.4 286.1  
Mortgage Loans on Real Estate, Commercial and Consumer, Net 10.6 0.0  
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2019 - $933.8; 2018 - $911.2) 908.5 909.0  
Long-term Debt, Fair Value 933.8 911.2  
Federal Home Loan Bank of Chicago [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 187.7 10.0 $ 10.0
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   10.0  
Loans To Policyholders [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans Receivable, Fair Value Disclosure 574.5 542.6  
Mortgage Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loans Receivable, Fair Value Disclosure $ 10.6 $ 0.0