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Unpaid Claims and Claim Expenses - Incurred and Paid Claims by Accident Year on a Net Basis (Details)
$ in Millions
Dec. 31, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Homeowners                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 1,270.0                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,217.2                  
Outstanding prior to 2012 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 52.8                  
Homeowners | 2012                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 106.0 $ 106.0 $ 106.0 $ 106.0 $ 106.3 $ 106.3 $ 106.5 $ 109.4 $ 109.2 $ 108.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 21,600,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 106.0 106.0 106.0 106.0 105.9 105.6 105.2 104.2 101.6 84.3
Homeowners | 2013                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 101.7 101.7 101.7 101.8 102.3 102.4 104.0 107.5 105.6  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 19,200,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 101.7 101.7 101.7 101.7 101.5 101.0 99.4 96.6 76.9  
Homeowners | 2014                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 106.4 106.4 106.6 106.6 106.8 109.1 113.5 111.6    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 20,100,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 106.4 106.4 106.4 106.3 106.1 105.7 103.0 83.3    
Homeowners | 2015                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 114.9 114.9 115.1 114.1 114.4 115.1 111.7      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 18,700,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 114.7 114.9 114.6 113.3 111.9 109.3 90.7      
Homeowners | 2016                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 117.9 117.9 117.9 117.0 118.6 115.9        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 19,900,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 117.8 117.7 117.5 115.1 113.2 95.8        
Homeowners | 2017                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 130.8 130.7 132.7 129.8 126.3          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.3                  
Cumulative Number of Reported Claims | claim 19,900,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 130.5 130.0 129.8 128.5 106.8          
Homeowners | 2018                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 158.1 158.9 157.4 166.8            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.4                  
Cumulative Number of Reported Claims | claim 21,100,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 157.4 157.0 152.4 130.5            
Homeowners | 2019                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 132.1 129.9 130.4              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 2.5                  
Cumulative Number of Reported Claims | claim 17,500,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 129.1 126.2 103.8              
Homeowners | 2020                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 151.9 155.7                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 11.1                  
Cumulative Number of Reported Claims | claim 19,600,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 138.7 106.8                
Homeowners | 2021                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 150.2                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 22.6                  
Cumulative Number of Reported Claims | claim 15,500,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 114.9                  
Auto liability                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,656.3                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,486.3                  
Outstanding prior to 2012 1.5                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 171.5                  
Auto liability | 2012                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 145.8 145.9 145.5 145.6 145.8 147.6 149.3 150.3 153.8 156.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 18,600,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 145.3 145.3 145.2 145.1 144.6 142.9 138.6 127.2 109.6 61.3
Auto liability | 2013                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 147.7 148.3 148.1 148.0 148.1 150.7 150.7 152.9 153.9  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 19,400,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 147.5 147.4 147.4 146.8 145.3 140.0 131.2 108.9 62.2  
Auto liability | 2014                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 159.4 159.3 159.4 159.8 159.9 158.5 157.2 155.1    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.2                  
Cumulative Number of Reported Claims | claim 20,300,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 158.8 158.6 157.6 155.8 149.1 139.5 117.5 61.3    
Auto liability | 2015                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 178.9 179.2 178.7 178.3 177.0 172.6 165.5      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.4                  
Cumulative Number of Reported Claims | claim 20,800,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 177.7 176.7 174.5 170.1 158.0 134.5 70.8      
Auto liability | 2016                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 189.2 188.1 186.6 184.6 184.4 180.4        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.5                  
Cumulative Number of Reported Claims | claim 21,300,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 188.1 184.5 177.8 166.8 140.9 73.1        
Auto liability | 2017                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 191.7 189.1 188.6 188.8 188.0          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.9                  
Cumulative Number of Reported Claims | claim 20,100,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 185.8 179.8 166.6 139.5 70.7          
Auto liability | 2018                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 189.8 192.9 195.3 200.3            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 3.8                  
Cumulative Number of Reported Claims | claim 19,500,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 180.7 168.6 141.5 77.5            
Auto liability | 2019                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 176.7 180.1 181.1              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 8.9                  
Cumulative Number of Reported Claims | claim 18,900,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 155.5 129.1 69.7              
Auto liability | 2020                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 134.9 137.0                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 20.1                  
Cumulative Number of Reported Claims | claim 13,100,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 94.0 51.5                
Auto liability | 2021                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 142.2                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 55.3                  
Cumulative Number of Reported Claims | claim 12,800,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 52.9                  
Auto physical damage                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 994.7                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 988.0                  
Outstanding prior to 2012 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6.7                  
Auto physical damage | 2012                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 83.3 83.3 83.3 83.3 83.3 83.4 83.4 83.4 82.3 83.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 78,200,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 83.3 83.3 83.3 83.3 83.3 83.3 83.4 83.4 83.4 $ 80.5
Auto physical damage | 2013                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 88.4 88.5 88.5 88.5 88.5 88.6 88.7 88.9 91.4  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 80,900,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 88.4 88.4 88.5 88.5 88.5 88.5 88.6 88.7 $ 85.1  
Auto physical damage | 2014                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 95.2 95.2 95.2 95.2 95.2 95.4 95.6 95.6    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 87,900,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 95.2 95.2 95.2 95.3 95.3 95.3 95.4 $ 88.9    
Auto physical damage | 2015                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 97.6 97.6 97.6 97.5 97.6 98.0 99.3      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 87,500,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 97.6 97.6 97.6 97.6 97.7 97.9 $ 92.1      
Auto physical damage | 2016                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 109.5 109.6 109.6 109.3 109.5 112.4        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 93,200,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 109.6 109.6 109.6 109.5 109.7 $ 106.5        
Auto physical damage | 2017                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 110.5 110.6 110.5 111.8 115.5          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 91,300,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 110.6 110.6 110.7 110.8 $ 105.2          
Auto physical damage | 2018                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 108.3 108.3 108.9 109.0            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 94,500,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 108.3 108.3 109.1 $ 103.6            
Auto physical damage | 2019                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 110.0 110.5 111.6              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (0.2)                  
Cumulative Number of Reported Claims | claim 92,200,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 110.1 110.7 $ 106.2              
Auto physical damage | 2020                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 86.9 87.0                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (0.8)                  
Cumulative Number of Reported Claims | claim 68,800,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 87.6 $ 84.1                
Auto physical damage | 2021                    
Short-duration Insurance Contracts, Historical Claims Duration                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 105.0                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (6.7)                  
Cumulative Number of Reported Claims | claim 69,700,000                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 97.3