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Reserves for Unpaid Losses and Loss Adjustment Expenses (Incurred Loss and Allocated LAE, Net of Reinsurance - Specialty Products - Casualty) (Details) - Casualty - Specialty Products
$ in Millions
Dec. 31, 2016
USD ($)
reported_claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Incurred Loss and Allocated LAE, Net of Reinsurance $ 1,976.1                  
2007                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 1,236                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 56.5 $ 57.1 $ 58.3 $ 61.8 $ 70.1 $ 70.5 $ 90.7 $ 97.3 $ 120.2 $ 138.3
Total IBNR plus expected development on reported claims $ 2.5                  
2008                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 2,199                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 96.8 97.3 95.3 95.5 98.3 100.8 118.2 128.6 $ 145.6  
Total IBNR plus expected development on reported claims $ 3.3                  
2009                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 4,002                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 195.5 195.0 194.9 192.0 193.2 194.9 186.2 $ 169.5    
Total IBNR plus expected development on reported claims $ 4.9                  
2010                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 6,029                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 240.0 234.9 232.3 225.0 226.2 225.4 $ 211.5      
Total IBNR plus expected development on reported claims $ 7.8                  
2011                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 6,661                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 214.9 214.8 214.2 205.4 189.8 $ 194.9        
Total IBNR plus expected development on reported claims $ 9.4                  
2012                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 6,794                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 249.4 248.8 246.1 220.1 $ 213.5          
Total IBNR plus expected development on reported claims $ 14.4                  
2013                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 5,866                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 247.9 229.6 233.1 $ 205.2            
Total IBNR plus expected development on reported claims $ 20.3                  
2014                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 6,504                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 258.9 235.9 $ 240.5              
Total IBNR plus expected development on reported claims $ 44.4                  
2015                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 9,710                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 213.4 $ 206.9                
Total IBNR plus expected development on reported claims $ 78.5                  
2016                    
Claims Development [Line Items]                    
Cumulative number of reported claims | reported_claim 9,093                  
Incurred Loss and Allocated LAE, Net of Reinsurance $ 202.8                  
Total IBNR plus expected development on reported claims $ 142.8