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Income Taxes Income by Region (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. $ (119.8) $ (782.1) $ (534.6)
Non-U.S. 33.3 48.1 56.6
Loss before income taxes $ (86.5) $ (734.0) $ (478.0)