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Income Taxes Income Statement table (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 341.8 $ 98.4 $ (8.7)
Foreign 168.4 71.7 (80.0)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest $ 510.2 $ 170.1 $ (88.7)