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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Policy Acquisition Costs  $ 306.6 $ 291.1 $ 248.5  
Net Reserves for Losses and LAE  3,970.1 4,632.0 4,996.6 $ 5,234.3
Net Reserves for Unearned Premiums 1,363.7 1,294.0 1,150.3  
Net earned premium 2,532.6 2,293.3 2,214.7  
Net Investment Income  154.6 197.3 198.2  
Losses and LAE Expenses  1,840.8 1,679.7 1,573.0  
Policy Acquisition Expenses  465.7 412.7 371.6  
Net written premiums 2,582.9 2,427.9 2,082.0  
General and Administrative Expenses  308.0 341.5 357.7  
Reinsurance        
Deferred Policy Acquisition Costs  206.8 210.3 208.3  
Net Reserves for Losses and LAE  2,095.7 2,605.9 2,843.6  
Net Reserves for Unearned Premiums 617.6 599.9 616.0  
Net earned premium 1,292.1 1,255.2 1,256.4  
Losses and LAE Expenses  958.6 917.9 927.0  
Policy Acquisition Expenses  246.0 264.9 260.9  
Net written premiums 1,302.1 1,251.1 1,182.9  
General and Administrative Expenses  110.8 111.7 118.5  
Insurance        
Deferred Policy Acquisition Costs  99.8 80.8 40.2  
Net Reserves for Losses and LAE  1,874.4 2,026.1 2,153.0  
Net Reserves for Unearned Premiums 746.1 694.1 534.3  
Net earned premium 1,240.5 1,038.1 958.3  
Losses and LAE Expenses  882.2 761.8 646.0  
Policy Acquisition Expenses  219.7 147.8 110.7  
Net written premiums 1,280.8 1,176.8 899.1  
General and Administrative Expenses  $ 197.2 $ 229.8 $ 239.2