Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Common Stock Held in Treasury	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 456.9	$ 0.3	$ (19.3)	$ 245.9	$ 416.5	$ (186.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19.7				19.7
Common stock cash dividends, $0.10 per share	(3.1)				(3.1)
Foreign currency translation adjustments, net of income taxes	(0.7)					(0.7)
Derivatives designated as hedges, net of income taxes	(0.7)					(0.7)
Pension and other postretirement liability adjustments, net of income taxes	1.7					1.7
Stock-based compensation expense	2.6			2.6
Ending balance at Mar. 31, 2019	476.4	0.3	(19.3)	248.5	433.1	(186.2)
Beginning balance at Dec. 31, 2019	569.5	0.3	(12.6)	241.8	532.8	(192.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29.0				29.0
Common stock cash dividends, $0.10 per share	(3.2)				(3.2)
Foreign currency translation adjustments, net of income taxes	(25.2)					(25.2)
Derivatives designated as hedges, net of income taxes	(2.4)					(2.4)
Pension and other postretirement liability adjustments, net of income taxes	1.5					1.5
Stock-based compensation expense	2.5			2.5
Ending balance at Mar. 31, 2020	$ 570.7	$ 0.3	$ (12.6)	$ 244.3	$ 557.6	$ (218.9)