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Postretirement and Other Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net pension benefit costs for U.S. and French employees during the three months ended March 31, 2021 and 2020 were as follows ($ in millions):
Three Months Ended March 31,
 U.S. Pension BenefitsFrench Pension Benefits
 2021202020212020
Service cost$— $— $0.3 $0.3 
Interest cost0.7 0.9 — — 
Expected return on plan assets(1.0)(1.2)— — 
Amortizations and other0.9 0.8 0.3 0.3 
Net periodic benefit cost$0.6 $0.5 $0.6 $0.6