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)	Adoption of ASC 326	Adoption of ASC 326 Retained Earnings
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	86.9				86.9
Issuance of treasury stock	0.0		4.8	(4.8)
Common stock cash dividends, $0.10 per share	(9.5)				(9.5)
Foreign currency translation adjustments, net of income taxes	(13.4)					(13.4)
Derivatives designated as hedges, net of income taxes	(1.8)					(1.8)
Pension and other postretirement liability adjustments, net of income taxes	3.9					3.9
Stock-based compensation expense	7.2			7.2
Taxes withheld on issuance of stock-based awards	(6.5)			(6.5)
Ending balance at Sep. 30, 2019	523.7	0.3	(14.5)	241.8	493.9	(197.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency, translation adjustments, tax	(1.9)
Beginning balance at Jun. 30, 2019	500.0	0.3	(14.4)	239.3	463.7	(188.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33.5				33.5
Issuance of treasury stock	0.0		(0.1)	0.1
Common stock cash dividends, $0.10 per share	(3.3)				(3.3)
Foreign currency translation adjustments, net of income taxes	(9.8)					(9.8)
Derivatives designated as hedges, net of income taxes	(0.2)					(0.2)
Pension and other postretirement liability adjustments, net of income taxes	1.1					1.1
Stock-based compensation expense	2.5			2.5
Taxes withheld on issuance of stock-based awards	(0.1)			(0.1)
Ending balance at Sep. 30, 2019	523.7	0.3	(14.5)	241.8	493.9	(197.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency, translation adjustments, tax	(1.3)
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	78.7				78.7
Issuance of treasury stock	0.0		11.6	(11.6)
Common stock cash dividends, $0.10 per share	(9.6)				(9.6)
Foreign currency translation adjustments, net of income taxes	(25.0)					(25.0)
Derivatives designated as hedges, net of income taxes	(4.5)					(4.5)
Pension and other postretirement liability adjustments, net of income taxes	4.6					4.6
Stock-based compensation expense	0.9			0.9
Taxes withheld on issuance of stock-based awards	(2.2)			(2.2)
Ending balance at Sep. 30, 2020	611.4	0.3	(1.0)	228.9	600.9	(217.7)	$ (1.0)	$ (1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency, translation adjustments, tax	0.5
Beginning balance at Jun. 30, 2020	596.6	0.3	(7.0)	236.1	586.9	(219.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17.2				17.2
Issuance of treasury stock	0.0		6.0	(6.0)
Common stock cash dividends, $0.10 per share	(3.2)				(3.2)
Foreign currency translation adjustments, net of income taxes	0.3					0.3
Derivatives designated as hedges, net of income taxes	(0.1)					(0.1)
Pension and other postretirement liability adjustments, net of income taxes	1.8					1.8
Stock-based compensation expense	(1.2)			(1.2)
Ending balance at Sep. 30, 2020	611.4	$ 0.3	$ (1.0)	$ 228.9	$ 600.9	$ (217.7)	$ (1.0)	$ (1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency, translation adjustments, tax	$ 1.5