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Commitments and Contingencies (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
GBP (£)
Other Commitment, Fiscal Year Maturity        
Rent expense $ 5.1 $ 5.0 $ 3.2  
Lloyds Syndicate [Member]        
Other Commitment, Fiscal Year Maturity        
FAL Deposit assets $ 95.8      
Line of credit extended to Lloyd's Syndicate, lending capacity | £       £ 10,000,000
Line of credit extended to Lloyd's Syndicate, interest rate 8.50%     8.50%
Unused commitments $ 1.2     £ 800,000
Non-Public Equity Funds [Member]        
Other Commitment, Fiscal Year Maturity        
Other commitment 110.0      
Other commitment, due in 2016 78.0      
Other commitment, due in 2017 and 2018 31.1      
Other commitment, due in 2019 and 2010 0.3      
Other commitment, due thereafter 0.6      
Qualified Affordable Housing Project [Member]        
Other Commitment, Fiscal Year Maturity        
Other commitment, due in 2016 0.3      
Other commitment, due in 2017 and 2018 0.4      
Other commitment, due in 2019 and 2010 0.3      
Other commitment, due thereafter 0.6      
Qualified affordable housing project investments $ 1.6