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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lessee, Operating Lease, Liability, Maturity
The following table presents the maturity of our operating lease liabilities as of December 31, 2020:

($ in millions)
2021$11.8 
20228.2 
20236.3 
20244.3 
20253.3 
Thereafter16.7 
Total lease payments50.6 
Less: imputed interest(8.2)
Total lease liabilities$42.4