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Schedule V - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule V - Valuation and Qualifying Accounts
SCHEDULE V - VALUATION AND QUALIFYING ACCOUNTS
For the Twelve Months Ended December 31, 2020, 2019 and 2018

 The following table shows the movement in the Company’s bad debt provision during the twelve months ended December 31, 2020, 2019 and 2018:
 Balance at
Beginning  of
Year 
Charged to
Costs and
Expenses 
Charged to
Other
Accounts 
Deductions
Balance at
End of  Year
 Provisions for Bad Debt($ in millions)
2020     
Premiums receivable from underwriting activities$23.0 $11.0 $— $— $34.0 
Reinsurance$— $— $— $— $— 
2019     
Premiums receivable from underwriting activities$16.2 $6.8 $— $— $23.0 
Reinsurance$— $— $— $— $— 
2018     
Premiums receivable from underwriting activities$5.2 $11.0 $— $— $16.2 
Reinsurance$— $— $— $— $—