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Income Taxes - Components of Pre-tax Book Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
U.S. $ (15.8) $ (39.7) $ 26.8
Foreign (69.7) (30.9) 28.6
Income (loss) before income taxes and equity in earnings of joint ventures $ (85.5) $ (70.6) $ 55.4