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Reinsurance and Policy Provisions (Hannover Financing Arrangements) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2013 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Waived surrender charges on penalty free withdrawals and deaths on certain business, percentage 45.60%    
Reserve credit $ 480.7 $ 322.5  
Risk charge rate 1.25%    
Risk charges $ 21.0 15.7  
2005 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Risk charges     $ 5.4
2011 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Risk charge rate 1.25%    
Risk charges $ 0.3 0.8 1.3
Net pretax statutory surplus benefit 49.2    
Reduction in pretax statutory surplus, current period $ 10.3 $ 10.8 11.3
2008 Hannover Reinsurance Agreement [Member]      
Ceded Credit Risk [Line Items]      
Risk charge rate 1.25%    
Risk charges     0.1
Net pretax statutory surplus benefit $ 29.5    
Reduction in pretax statutory surplus, current period     $ 6.9