Long-term Employee Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income to be Amortized (Details) - Pension Plan [Member] $ in Millions	Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amortization of net actuarial losses, net	$ (3.5)
Amortization of prior service credit, net	0.1
Total	$ (3.4)