CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2014		17,849
Beginning Balance at Dec. 31, 2014		$ 0.2	$ (31.7)	$ 300.4	$ 88.2	$ (68.4)
Increase (Decrease) in Stockholders' Equity
Net income	$ 51.1				51.1
Other comprehensive loss, after income taxes	(9.9)					(9.9)
Dividends declared					(20.3)
Excess tax benefits from stock-based compensation	2.6			2.6
Shares purchased (Note 10)			(5.9)
Stock options exercised (in shares)		108
Stock options exercised				1.2
Restricted stock vesting (in shares)		106
Restricted stock vesting (Note 10)			(2.5)
Stock-based compensation				6.5
Other/Currency				0.1
Ending balance (in shares) at Dec. 31, 2015		18,063
Ending Balance at Dec. 31, 2015		$ 0.2	(40.1)	310.8	119.0	(78.3)
Increase (Decrease) in Stockholders' Equity
Net income	73.0				73.0
Other comprehensive loss, after income taxes	(13.7)					(13.7)
Dividends declared					(22.4)
Excess tax benefits from stock-based compensation	3.1		(12.6)
Shares purchase (in shares)		71
Shares purchased (Note 10)				0.4
Stock options exercised (in shares)		111
Stock options exercised			(3.8)
Restricted stock vesting (Note 10)				5.8
Ending balance (in shares) at Dec. 31, 2016		18,245
Ending Balance at Dec. 31, 2016	338.3	$ 0.2	(56.5)	317.0	169.6	(92.0)
Increase (Decrease) in Stockholders' Equity
Net income	80.3				80.3
Other comprehensive loss, after income taxes	8.8					8.8
Dividends declared					(25.1)
Excess tax benefits from stock-based compensation	4.5
Shares purchased (Note 10)			(6.8)
Stock options exercised (in shares)		140
Stock options exercised				0.4
Restricted stock vesting (in shares)		73
Restricted stock vesting (Note 10)			(2.5)
Stock-based compensation				6.4
Reclassification of the stranded tax effects related to the Tax Act (Note 10)	(10.9)				10.9
Other/Currency				0.1
Ending balance (in shares) at Dec. 31, 2017		18,458
Ending Balance at Dec. 31, 2017	$ 399.9	$ 0.2	$ (65.8)	$ 323.9	$ 235.7	$ (94.1)