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Schedule V - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule V - Valuation and Qualifying Accounts
VALUATION AND QUALIFYING ACCOUNTS
 Additions    
($ in millions)Balance at
beginning
of period		Charged to
costs and
expenses		 Charge
to other
accounts		 (Deductions) Balance at
end of
period
Year Ended December 31, 2024
        
Valuation allowance for deferred tax assets$322.4 $41.6  $—  $—  $364.0 
Allowance for premium receivables$2.5 $0.3 $— $— $2.8 
Year Ended December 31, 2023
        
Valuation allowance for deferred tax assets$283.0 $39.4  $—  $—  $322.4 
Allowance for premium receivables$2.7 $—  $—  $(0.2)$2.5