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Postretirement and Other Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net pension benefit costs for U.S., French and UK employees during the three or six months ended June 30, 2021 and 2020 were as follows ($ in millions):
Three Months Ended June 30,
 U.S. Pension BenefitsFrench Pension BenefitsUK Pension Benefits
 202120202021202020212020
Service cost$— $— $0.4 $0.3 $— $— 
Interest cost0.7 1.0 0.1 0.1 0.8 — 
Expected return on plan assets(1.0)(1.3)— — (0.9)— 
Amortizations and other0.9 0.8 0.2 0.1 — — 
Net periodic benefit cost$0.6 $0.5 $0.7 $0.5 $(0.1)$— 
Six Months Ended June 30,
 U.S. Pension BenefitsFrench Pension BenefitsUK Pension Benefits
 202120202021202020212020
Service cost$— $— $0.7 $0.6 $— $— 
Interest cost1.4 1.9 0.1 0.1 0.8 — 
Expected return on plan assets(2.0)(2.5)— — (0.9)— 
Amortizations and other1.8 1.6 0.5 0.4 — — 
Net periodic benefit cost$1.2 $1.0 $1.3 $1.1 $(0.1)$—