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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements 100.00%    
Property, Plant and Equipment, Useful Life 40 years    
Other Asset Impairment Charges $ 4.7 $ 24.5 $ 0.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 97.0 79.4  
Property, Plant and Equipment, Gross 248.7 236.1  
Depreciation 18.3 17.2 16.6
Goodwill 7.0 7.0  
Present Value of Future Insurance Profits, Net 5.1 3.3  
Present Value of Future Insurance Profits, Accumulated Amortization 15.0 14.6  
Amortization of Value of Business Acquired (VOBA) 0.4 0.3 0.5
Values Of Business Acquired Distribution Agreements And Customer Relationships 40.8 49.2  
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships 79.8 71.5  
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships 8.3 8.7 9.0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 8.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 7.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 6.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6.2    
Capitalized Computer Software, Net 150.4 145.5  
Capitalized Computer Software, Amortization $ 26.9 $ 35.7 $ 10.3
Value of Customer Relationships Acquired [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years    
Value of Distribution Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years