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Debt (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Summary of Indebtedness Outstanding
Indebtedness and scheduled maturities consisted of the following:
($ in millions)Interest
Rates		Final
Maturity		December 31,
20222021
Short-term debt
Revolving Credit FacilityVariable2026$249.0 $249.0 
Long-term debt(1)
4.50% Senior Notes, Aggregate principal amount of
$250.0 less unaccrued discount of $0.2 and
$0.3 and unamortized debt issuance costs
of $0.8 and $1.1
4.50%2025249.0 248.6 
FHLB borrowings0.00%2022— 5.0 
Total
$498.0 $502.6 
(1)    The Company designates debt obligations as "long-term" based on maturity date at issuance.