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)
Stockholders' equity, beginning balance at Dec. 31, 2014	$ 119.2	$ 0.3	$ (1.5)	$ 71.1	$ 166.4	$ (117.1)
Net income	55.9				55.9
Issuance of common stock	0.0		3.1	(3.1)
Taxes withheld on issuance of stock-based awards	(5.8)			(5.8)
Excess tax benefits on stock-based payment arrangements	2.2			2.2
Dividends on stock-based payment arrangements	(0.4)				(0.4)
Common stock cash dividends	(10.8)				(10.8)
Share repurchases	(7.7)		(7.7)
Foreign currency translation adjustments	(21.9)					(21.9)
Derivatives designated as hedges, net of tax	(0.8)					(0.8)
Pension and other post-retirement benefits adjustments, net of tax	(7.4)					(7.4)
Stock-based compensation expense	7.2			7.2
Stockholders' equity, ending balance at Dec. 31, 2015	129.7	0.3	(6.1)	71.6	211.1	(147.2)
Net income	67.6				67.6
Issuance of common stock	0.0		3.2	(3.2)
Taxes withheld on issuance of stock-based awards	(2.6)			(2.6)
Excess tax benefits on stock-based payment arrangements	1.5			1.5
Dividends on stock-based payment arrangements	(0.4)				(0.4)
Common stock cash dividends	(11.7)				(11.7)
Share repurchases	(4.3)		(4.3)
Foreign currency translation adjustments	(5.7)					(5.7)
Derivatives designated as hedges, net of tax	0.7					0.7
Pension and other post-retirement benefits adjustments, net of tax	(4.8)					(4.8)
Stock-based compensation expense	9.9			9.9
Stockholders' equity, ending balance at Dec. 31, 2016	179.9	0.3	(7.2)	77.2	266.6	(157.0)
Cumulative adjustment - Change in accounting policy ASU 2016-09	0.0			0.6	(0.6)	0.0
Net income	80.5				80.5
Issuance of treasury stock	0.0		8.2	(8.2)
Issuance of common stock	184.1		0.0	184.1
Taxes withheld on issuance of stock-based awards	(10.5)			(10.5)
Dividends on stock-based payment arrangements	(0.4)				(0.4)
Common stock cash dividends	(12.4)				(12.4)
Share repurchases	(5.0)		(5.0)
Foreign currency translation adjustments	20.5					20.5
Derivatives designated as hedges, net of tax	1.5					1.5
Pension and other post-retirement benefits adjustments, net of tax	(5.3)					(5.3)
Stock-based compensation expense	9.0			9.0
Stockholders' equity, ending balance at Dec. 31, 2017	$ 441.9	$ 0.3	$ (4.0)	$ 252.2	$ 333.7	$ (140.3)