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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Policy Acquisition Costs  $ 322.1 $ 296.2 $ 319.0  
Net Reserves for Losses and LAE  3,950.6 3,232.8 2,813.2 $ 4,313.7
Net Reserves for Unearned Premiums 1,744.1 1,692.8 1,720.2  
Net earned premiums 2,889.7 2,614.5 2,688.7  
Net Investment Income  318.0 275.7 188.1  
Losses and LAE Expenses  1,717.8 1,553.0 1,680.0  
Policy Acquisition Expenses  420.2 380.2 431.8  
Net written premiums 2,942.6 2,581.9 2,896.0  
General and Administrative Expenses  405.9 354.5 386.5  
Reinsurance        
Deferred Policy Acquisition Costs  248.2 201.5 227.2  
Net Reserves for Losses and LAE  1,691.5 1,373.1 1,360.7  
Net Reserves for Unearned Premiums 580.0 644.5 862.4  
Net earned premiums 1,305.7 1,154.5 1,251.8  
Losses and LAE Expenses  741.3 611.1 770.3  
Policy Acquisition Expenses  227.0 208.6 252.4  
Net written premiums 1,275.7 1,098.0 1,426.4  
General and Administrative Expenses  141.7 120.6 142.5  
Insurance        
Deferred Policy Acquisition Costs  73.9 94.7 91.8  
Net Reserves for Losses and LAE  2,259.1 1,859.7 1,452.5  
Net Reserves for Unearned Premiums 1,164.1 1,048.3 857.8  
Net earned premiums 1,584.0 1,460.0 1,436.9  
Losses and LAE Expenses  976.5 941.9 909.7  
Policy Acquisition Expenses  193.2 171.6 179.4  
Net written premiums 1,666.9 1,483.9 1,469.6  
General and Administrative Expenses  $ 264.2 $ 233.9 $ 244.0