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Long-term Employee Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Long-term Employee Benefits LONG-TERM EMPLOYEE BENEFITS
Components of Net Periodic Benefit Cost
The following table sets forth the components of net periodic benefit costs for the three and six months ended June 30, 2021 and 2020:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Components of net periodic benefit cost:
Net periodic benefit cost:
Service cost$2.0 $1.9 $3.8 $3.7 
Interest cost1.9 2.3 3.9 4.6 
Expected return on plan assets(3.5)(3.1)(6.9)(6.3)
Amortization of actuarial loss, net1.3 0.8 2.5 1.8 
Plan curtailments— (0.6)— (1.8)
Net periodic benefit cost$1.7 $1.3 $3.3 $2.0 
All non-service components of net periodic benefit cost are recorded in other income, net within the accompanying condensed consolidated statements of operations.