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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Non-printing) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Feb. 24, 2015
Dec. 31, 2014
Feb. 27, 2014
Amortized Cost of Fixed Maturity Securities $ 4,560.7   $ 4,341.7  
Fair Value of Notes Payable 781.3   804.4  
Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member]        
Senior Notes Payable, Interest Rate   4.35%    
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member]        
Senior Notes Payable, Interest Rate       7.375%
Parent Company [Member]        
Amortized Cost of Fixed Maturity Securities 15.1   12.2  
Equity Securities at Cost 11.1   21.9  
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2017 [Member]        
Fair Value of Notes Payable $ 374.0   $ 390.2  
Senior Notes Payable, Interest Rate 6.00%   6.00%  
Parent Company [Member] | Senior Notes [Member] | Senior Notes Payable, 6.00% due 2015 [Member]        
Fair Value of Notes Payable     $ 260.2  
Senior Notes Payable, Interest Rate     6.00%  
Parent Company [Member] | Senior Notes [Member] | Senior Notes, 4.35 Percent Due February 15, 2025 [Member]        
Fair Value of Notes Payable $ 248.3   $ 0.0  
Senior Notes Payable, Interest Rate 4.35%   4.35%  
Parent Company [Member] | Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member]        
Fair Value of Notes Payable $ 159.0   $ 154.0  
Senior Notes Payable, Interest Rate 7.375%   7.375%