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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Schedule of Maturity of Operating Lease Liabilities
The following table presents the maturities of our operating lease liabilities as of December 31, 2020 ($ in millions):
2021$49.9 
202242.0 
202329.8 
202422.2 
202515.1 
Thereafter62.7 
Total lease payments221.7 
Less: imputed interest(20.4)
Total lease liabilities$201.3