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Long-term Employee Benefits (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net periodic benefit cost        
Service cost $ 1.4 $ 1.6 $ 2.9 $ 3.3
Interest cost 5.0 2.5 9.7 4.9
Expected return on plan assets (2.8) (3.1) (5.5) (6.3)
Amortization of actuarial losses, net 0.2 0.8 0.4 1.7
Amortization of prior service cost, net (0.1) (0.1) (0.1) (0.1)
Net periodic benefit cost $ 3.7 $ 1.7 $ 7.4 $ 3.5