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Operating Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Lease, Cost The following table summarizes the operating lease charge for the twelve months ended December 31, 2024, 2023 and 2022:
For the Twelve Months Ended
December 31, 2024December 31, 2023December 31, 2022
($ in millions)
Amortization charge on right-of-use operating leased assets$9.9 $10.7 $10.1 
Interest on operating lease liabilities4.1 4.5 5.4 
Operating lease charge$14.0 $15.2 $15.5 
Lessee, Operating Lease, Liability The following table summarizes the maturity of lease liabilities under non-cancellable leases as of December 31, 2024 and 2023:
December 31, 2024December 31, 2023
($ in millions)
Operating leases — maturities
2024$— $15.4 
202515.4 15.1 
202614.6 14.3 
202713.2 12.8 
202813.0 12.7 
202910.9 11.2 
Later years21.5 21.2 
Total minimum lease payments$88.6 $102.7 
Less imputed interest(13.0)(16.6)
Total lease liabilities$75.6 $86.1 
Summary of Other Lease Information The following table summarizes the cash flows on operating leases for the twelve months ended December 31, 2024, 2023 and 2022 and other supplemental information:
For the Twelve Months Ended
December 31, 2024December 31, 2023December 31, 2022
($ in millions)
Cash paid for amounts included in the measurement of lease liabilities
 - Operating cash outflow from operating leases$(15.9)$(15.5)$(15.5)
Right-of-use assets obtained in exchange for lease obligations
 - Operating leases$2.1 $0.2 $1.9 
Reduction to Right-of-use assets resulting from reductions to lease obligations
 - Operating leases$0.3 $0.1 $7.0 
Weighted Averages
 - Operating leases, remaining lease terms (years)6.47.38.1
 - Operating leases, average discount rate5.1 %5.0 %5.0 %