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Long-term Employee Benefits - Schedule of Amounts in Accumulated Other Comprehensive Income to be Amortized (Details) - Pension Plan [Member]
$ in Millions
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Amortization of net actuarial losses, net $ (2.0)
Amortization of prior service credit, net 0.1
Total $ (1.9)