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Long-term Employee Benefits - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - Pension Plan [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Accumulated net actuarial losses $ (51.8) $ (46.4)
Accumulated prior service credit 1.6 2.6
Total $ (50.2) $ (43.8)