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Leases (Tables)
 9 Months Ended
Sep. 30, 2023
Leases [Abstract]  
Schedule of Lease Expense The components of lease expense were as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
($ in millions)2023202220232022
Operating lease cost$4.3 $3.7 $15.0 $10.4 
Short-term lease cost1.9 0.3 4.4 1.1 
Variable lease cost1.4 2.3 4.4 4.7 
Total lease cost$7.6 $6.3 $23.8 $16.2 
Schedule of Supplemental Cash Flow Information Related to Leases Supplemental cash flow information related to leases were as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
($ in millions)2023202220232022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$4.5 $3.7 $14.4 $10.0 
Right-of-use assets obtained in exchange for new operating lease liabilities$3.1 $14.0 $6.6 $29.5 
Schedule of Maturities of Operating Lease Liabilities Maturities of operating lease liabilities were as follows:
($ in millions)September 30,December 31,
Year20232022
2023 (remaining period as of)$4.8 $19.0 
202419.1 18.1 
202517.1 16.0 
202614.1 13.4 
20279.8 9.4 
Thereafter50.6 50.8 
115.5 126.7 
Less: imputed lease interest(16.0)(17.7)
Total lease liabilities$99.5 $109.0