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Accumulated Other Comprehensive Loss (Reclassifications from Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications for the period   $ 2.9 $ 7.0
Impact of income taxes   (0.3) (2.7)
Total reclassifications for the period, net of tax $ 0.0 (2.6) (4.3)
Pension Benefits      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Settlement charge on pension benefit plans, net of tax   0.5 4.3
Restructuring Charges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Revaluation (gain) loss on sale   2.1 0.0
Net Pension Income | Pension Benefits      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Settlement charge on pension benefit plans   0.8 7.0
Income Tax Expense (Benefit) | Pension Benefits      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Impact of income taxes   $ (0.3) $ (2.7)