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Reserves for Losses and Loss Adjustment Expenses (Tables)
6 Months Ended
Jun. 30, 2020
Insurance [Abstract]  
Reserves for Losses and Loss Adjustment Expenses
The following table provides a reconciliation of reserves for losses and loss adjustment expenses (“LAE”):
For the Six Months Ended
June 30,
(in millions)20202019
Net reserves beginning of the year$2,722.7  $2,562.9  
Net AIL reserves acquired27.9  —  
Add:
Losses and LAE incurred during current calendar year, net of reinsurance:
Current accident year549.6  502.9  
Prior accident years4.5  19.8  
Losses and LAE incurred during calendar year, net of reinsurance554.1  522.7  
Deduct:
Losses and LAE payments made during current calendar year, net of reinsurance:
Current accident year125.3  89.8  
Prior accident years451.5  432.4  
Losses and LAE payments made during current calendar year, net of reinsurance:576.8  522.2  
Change in participation interest (1)
33.0  (14.4) 
Foreign exchange adjustments(8.5) (13.0) 
Net reserves - end of period2,752.4  2,536.0  
Add:
Reinsurance recoverables on unpaid losses and LAE, end of period2,463.9  2,199.7  
Gross reserves - end of period$5,216.3  $4,735.7  
(1)Amount represents the change in reserves due to changing our participation in Syndicates 1200 and 1910.
Impact from (Favorable) Unfavorable Development of Prior Accident Years’ Loss and LAE Reserves on Each Reporting Segment
The impact from the unfavorable development of prior accident years’ loss and LAE reserves on each reporting segment is presented below: 
For the Six Months Ended
June 30,
(in millions)20202019
U.S. Operations$2.7  $(9.1) 
International Operations1.1  27.2  
Run-off Lines0.7  1.7  
Total unfavorable prior-year development$4.5  $19.8