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Income Taxes (Schedule of Income Tax Expense and Effective Tax Rate) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Income before income taxes and equity in net income (loss) of unconsolidated entities $ 48.4 $ 72.7 $ 55.0 $ 56.8 $ 41.9 $ 50.8 $ 61.3 $ 27.1 $ 232.9 $ 181.1 $ 224.9
Equity in net income (loss) of unconsolidated entities (0.5) 0.3 (0.4) (1.5) (0.3) 0.0 (0.2) (0.8) (2.1) (1.3) (0.2)
Income loss from continuing operations before income taxes domestic and foreign                 230.8 179.8 224.7
Income tax expense $ 5.5 $ 16.1 $ 12.8 $ 13.4 $ 2.7 $ 16.9 $ 15.0 $ 8.3 $ 47.8 $ 42.9 $ 63.7
Effective income tax rate                 20.70% 23.90% 28.30%