Accumulated Other Comprehensive Loss (Reclassifications from Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period			$ 2.9
Impact of income taxes			(0.3)
Total reclassifications for the period, net of tax	$ 0.0	$ 0.0	(2.6)
Pension Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement charge on pension benefit plans, net of tax			0.5
Restructuring Charges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revaluation (gain) loss on sale			2.1
Net Pension Income | Pension Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement charge on pension benefit plans			0.8
Income Tax Expense (Benefit) | Pension Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Impact of income taxes			$ (0.3)