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Loss and Loss Adjustment Expense Reserves (Tables)
9 Months Ended
Sep. 30, 2020
Loss and Loss Adjustment Expenses Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense Activity in the loss and loss adjustment expense reserves is summarized as follows:
September 30,
(millions)20202019
Balance at January 1$18,105.4 $15,400.8 
Less reinsurance recoverables on unpaid losses3,212.2 2,572.7 
Net balance at January 114,893.2 12,828.1 
Incurred related to:
Current year18,073.6 18,108.2 
Prior years116.1 215.2 
Total incurred18,189.7 18,323.4 
Paid related to:
Current year10,615.2 10,864.9 
Prior years6,682.8 6,061.7 
Total paid17,298.0 16,926.6 
Net balance at September 3015,784.9 14,224.9 
Plus reinsurance recoverables on unpaid losses3,804.3 3,145.1 
Balance at September 30$19,589.2 $17,370.0