Pensions and Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated net loss	$ 1.9
SERP income	2.3	$ 5.4	$ 4.3
Other long-term liabilities	0.0	0.0
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated net loss	0.2
SERP income	(0.5)	(0.3)	(0.3)
Other long-term liabilities	7.1	7.6
SERP
Defined Benefit Plan Disclosure [Line Items]
Annual supplemental retirement benefit	0.4
SERP income	0.1	$ 0.1	$ 0.2
Other long-term liabilities	$ 3.0