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Reserve For Losses And Loss Expenses (Claims Development - North American Insurance) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Claims
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Claims Development [Line Items]              
Other reserves not included in the loss development triangles $ 43.6            
Liability for losses and loss expenses, net of reinsurance 4,900.4            
North American Insurance | General casualty              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 1,477.3            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 554.4            
Other reserves not included in the loss development triangles 157.0            
Liability for losses and loss expenses, net of reinsurance 1,079.9            
North American Insurance | General casualty | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 268.4            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 10.0            
Total IBNR $ 244.3            
Cumulative Reported Claims | Claims 614            
North American Insurance | General casualty | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 279.1 $ 288.0          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 34.2 11.0          
Total IBNR $ 214.8            
Cumulative Reported Claims | Claims 820            
North American Insurance | General casualty | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 232.4 222.4 $ 220.2        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 103.9 58.3 8.5        
Total IBNR $ 94.7            
Cumulative Reported Claims | Claims 763            
North American Insurance | General casualty | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 237.4 208.9 192.4 $ 184.0      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 103.6 70.2 38.6 9.7      
Total IBNR $ 90.3            
Cumulative Reported Claims | Claims 638            
North American Insurance | General casualty | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 188.5 166.3 150.7 147.9 $ 144.4    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 114.0 85.4 53.2 25.9 6.5    
Total IBNR $ 42.7            
Cumulative Reported Claims | Claims 388            
North American Insurance | General casualty | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 144.2 136.7 143.0 145.1 140.7 $ 120.7  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 91.8 79.0 53.0 32.8 11.2 2.1  
Total IBNR $ 36.8            
Cumulative Reported Claims | Claims 347            
North American Insurance | General casualty | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 127.3 143.5 149.3 151.5 158.4 156.8 $ 133.8
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 96.8 87.4 83.0 72.8 65.9 28.4 0.6
Total IBNR $ 23.6            
Cumulative Reported Claims | Claims 277            
North American Insurance | Professional liability              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 1,619.5            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 817.6            
Other reserves not included in the loss development triangles 89.7            
Liability for losses and loss expenses, net of reinsurance 891.6            
North American Insurance | Professional liability | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 256.0            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 9.5            
Total IBNR $ 234.1            
Cumulative Reported Claims | Claims 127            
North American Insurance | Professional liability | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 258.9 254.2          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 61.0 9.0          
Total IBNR $ 165.7            
Cumulative Reported Claims | Claims 269            
North American Insurance | Professional liability | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 235.7 233.7 213.0        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 125.6 69.8 11.7        
Total IBNR $ 79.2            
Cumulative Reported Claims | Claims 378            
North American Insurance | Professional liability | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 240.4 225.8 226.8 220.9      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 142.8 95.8 50.0 9.6      
Total IBNR $ 77.3            
Cumulative Reported Claims | Claims 534            
North American Insurance | Professional liability | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 265.6 271.1 274.0 266.2 193.5    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 181.1 146.5 98.0 62.5 15.8    
Total IBNR $ 46.9            
Cumulative Reported Claims | Claims 530            
North American Insurance | Professional liability | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 210.7 214.4 235.4 228.7 206.4 182.5  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 179.5 152.7 124.7 102.6 56.1 13.6  
Total IBNR $ 24.4            
Cumulative Reported Claims | Claims 474            
North American Insurance | Professional liability | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 152.3 154.8 169.3 178.0 190.5 196.5 189.4
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 118.2 97.5 91.3 78.1 57.0 36.5 7.9
Total IBNR $ 23.1            
Cumulative Reported Claims | Claims 334            
North American Insurance | General property              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 666.4            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 587.9            
Other reserves not included in the loss development triangles 0.5            
Liability for losses and loss expenses, net of reinsurance 79.0            
North American Insurance | General property | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 101.3            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 46.7            
Total IBNR $ 11.8            
Cumulative Reported Claims | Claims 1,502            
North American Insurance | General property | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 114.4 110.7          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 98.5 51.6          
Total IBNR $ 3.3            
Cumulative Reported Claims | Claims 1,448            
North American Insurance | General property | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 88.9 96.0 97.0        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 83.8 73.1 32.3        
Total IBNR $ 0.3            
Cumulative Reported Claims | Claims 1,344            
North American Insurance | General property | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 68.9 69.8 75.3 81.6      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 67.8 64.6 56.3 25.4      
Total IBNR $ 0.1            
Cumulative Reported Claims | Claims 923            
North American Insurance | General property | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 136.3 136.9 140.5 146.9 157.7    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 135.0 134.7 127.8 98.0 20.5    
Total IBNR $ 0.3            
Cumulative Reported Claims | Claims 599            
North American Insurance | General property | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 107.9 110.2 111.4 115.0 121.8 124.3  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 108.1 107.4 106.2 98.6 69.8 24.6  
Total IBNR $ (0.1)            
Cumulative Reported Claims | Claims 448            
North American Insurance | General property | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 48.8 48.8 48.6 47.7 49.6 54.0 66.9
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 48.1 47.9 47.4 45.7 40.9 34.2 16.4
Total IBNR $ 0.7            
Cumulative Reported Claims | Claims 330            
North American Insurance | Programs              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 513.4            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 257.0            
Other reserves not included in the loss development triangles 9.4            
Liability for losses and loss expenses, net of reinsurance 265.8            
North American Insurance | Programs | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 113.6            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 14.1            
Total IBNR $ 72.3            
Cumulative Reported Claims | Claims 1,281            
North American Insurance | Programs | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 86.2 86.8          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 26.3 9.3          
Total IBNR $ 43.5            
Cumulative Reported Claims | Claims 1,266            
North American Insurance | Programs | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 70.0 73.9 74.9        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 27.5 16.9 6.4        
Total IBNR $ 28.8            
Cumulative Reported Claims | Claims 1,201            
North American Insurance | Programs | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 56.2 59.7 62.0 64.9      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 33.0 24.4 15.8 5.7      
Total IBNR $ 14.5            
Cumulative Reported Claims | Claims 871            
North American Insurance | Programs | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 58.9 59.6 62.4 60.5 56.7    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 44.5 38.3 29.6 17.6 3.8    
Total IBNR $ 5.7            
Cumulative Reported Claims | Claims 496            
North American Insurance | Programs | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 53.5 52.5 58.1 62.6 61.9 54.0  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 45.3 41.3 34.7 26.7 15.2 3.8  
Total IBNR $ 4.4            
Cumulative Reported Claims | Claims 446            
North American Insurance | Programs | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 75.0 75.5 78.8 80.8 86.4 72.5 70.7
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 66.3 63.4 59.9 52.3 42.4 17.9 2.9
Total IBNR $ 2.6            
Cumulative Reported Claims | Claims 479            
North American Insurance | Healthcare              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 634.1            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 349.7            
Other reserves not included in the loss development triangles 16.8            
Liability for losses and loss expenses, net of reinsurance 301.2            
North American Insurance | Healthcare | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 51.1            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 0.9            
Total IBNR $ 47.6            
Cumulative Reported Claims | Claims 17            
North American Insurance | Healthcare | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 76.8 76.8          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 8.5 0.6          
Total IBNR $ 58.0            
Cumulative Reported Claims | Claims 85            
North American Insurance | Healthcare | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 92.5 92.5 84.4        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 26.5 9.0 1.0        
Total IBNR $ 46.4            
Cumulative Reported Claims | Claims 150            
North American Insurance | Healthcare | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 123.9 123.9 111.2 85.4      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 84.6 56.9 12.6 2.6      
Total IBNR $ 18.8            
Cumulative Reported Claims | Claims 227            
North American Insurance | Healthcare | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 113.7 113.7 99.4 91.4 87.9    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 77.5 54.8 34.3 15.1 1.3    
Total IBNR $ 8.5            
Cumulative Reported Claims | Claims 260            
North American Insurance | Healthcare | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 113.3 113.6 108.1 94.5 87.1 85.9  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 99.9 84.0 69.6 42.5 10.9 0.5  
Total IBNR $ 4.5            
Cumulative Reported Claims | Claims 248            
North American Insurance | Healthcare | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 62.8 63.4 64.2 79.8 79.3 76.4 78.5
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 51.9 48.5 39.8 28.9 17.1 6.4 1.2
Total IBNR $ 6.8            
Cumulative Reported Claims | Claims 156            
North American Insurance | Specialty              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 209.6            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 75.6            
Other reserves not included in the loss development triangles 0.0            
Liability for losses and loss expenses, net of reinsurance 134.0            
North American Insurance | Specialty | 2016              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance 70.1            
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 4.2            
Total IBNR $ 62.4            
Cumulative Reported Claims | Claims 520            
North American Insurance | Specialty | 2015              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 48.2 47.4          
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 13.4 4.1          
Total IBNR $ 30.6            
Cumulative Reported Claims | Claims 352            
North American Insurance | Specialty | 2014              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 34.3 33.6 30.6        
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 18.6 13.0 5.2        
Total IBNR $ 12.1            
Cumulative Reported Claims | Claims 331            
North American Insurance | Specialty | 2013              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 16.6 16.6 16.6 16.6      
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 4.4 3.2 2.3 0.8      
Total IBNR $ 10.6            
Cumulative Reported Claims | Claims 73            
North American Insurance | Specialty | 2012              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 21.2 21.3 22.5 21.2 21.2    
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 17.9 17.5 14.7 10.2 0.5    
Total IBNR $ 2.3            
Cumulative Reported Claims | Claims 19            
North American Insurance | Specialty | 2011              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 18.7 18.7 18.7 18.3 18.9 16.5  
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 16.7 15.9 15.1 14.5 11.2 4.0  
Total IBNR $ 0.7            
Cumulative Reported Claims | Claims 16            
North American Insurance | Specialty | 2010              
Claims Development [Line Items]              
Incurred Claims and Loss Adjustment Expenses, Net of Reinsurance $ 0.4 0.3 0.5 0.6 0.9 0.9 0.9
Cumulative Paid Claims and Loss Adjustment Expenses, Net of Reinsurance 0.4 $ 0.1 $ 0.1 $ 0.1 $ 0.0 $ 0.0 $ 0.0
Total IBNR $ 0.0            
Cumulative Reported Claims | Claims 9