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Long-term Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
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