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Income Taxes - Components of Pre-tax Book Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ (39.7) $ 26.8 $ (86.6)
Foreign (30.9) 28.6 (164.3)
Income (loss) before income taxes and equity in earnings of joint ventures $ (70.6) $ 55.4 [1] $ (250.9)
[1] As adjusted due to the adoption of ASU 2017-07 Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost