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Income Tax Matters Income Tax Matters, Income Before Income Taxes Table (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 127.9 $ 143.6 $ (373.6)
Foreign 5.1 3.6 1.8
Income (loss) before income taxes $ 133.0 $ 147.2 $ (371.8)