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Leases (Tables)
 6 Months Ended
Jun. 30, 2022
Leases [Abstract]  
Schedule of Lease, Cost The components of lease expense were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
($ in millions)2022202120222021
Operating lease cost$3.4 $3.1 $6.7 $6.2 
Short-term lease cost0.4 0.3 0.8 0.5 
Variable lease cost1.0 1.4 2.4 2.2 
Total lease cost$4.8 $4.8 $9.9 $8.9 
Schedule of Cash Flow and Supplemental Information Supplemental cash flow information related to leases were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
($ in millions)2022202120222021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$3.1 $3.1 $6.3 $6.3 
Right-of-use assets obtained in exchange for new operating lease liabilities$5.8 $0.3 $15.5 $0.8 
Schedule of Lessee, Operating Lease, Liability, Maturity Maturities of operating lease liabilities were as follows:
($ in millions)June 30,December 31,
Year20222021
2022 (remaining period as of )$6.6 $11.5 
202312.3 10.7 
202411.6 10.0 
20259.7 8.2 
20268.7 7.3 
Thereafter46.3 38.7 
95.2 86.4 
Less: imputed lease interest(14.7)(14.1)
Total lease liabilities$80.5 $72.3