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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Schedule of Maturity of Operating Lease Liabilities The following table presents the maturities of our operating lease liabilities as of December 31, 2021 ($ in millions):
2022$45.6 
202336.7 
202427.6 
202519.5 
202615.6 
Thereafter58.3 
Total lease payments203.3 
Less: imputed interest(18.8)
Total lease liabilities$184.5