Long-term Employee Benefits (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net periodic benefit cost
Service cost	$ 1.5	$ 1.5	$ 4.4	$ 4.8
Interest cost	5.0	2.3	14.7	7.2
Expected return on plan assets	(2.9)	(2.8)	(8.4)	(9.1)
Amortization of actuarial losses, net	0.2	0.7	0.6	2.4
Amortization of prior service credit, net	0.0	0.0	(0.1)	(0.1)
Net periodic benefit cost	$ 3.8	$ 1.7	$ 11.2	$ 5.2