CONDENSED 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 Income (Loss)
Beginning balance (in shares) at Dec. 31, 2017		18,458
Balance at the beginning of the period at Dec. 31, 2017	$ 399.9	$ 0.2	$ (65.8)	$ 323.9	$ 235.7	$ (94.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16.2				16.2
Other comprehensive income, after income tax benefit	7.3					7.3
Dividends declared	(7.0)				(7.0)
Shares purchased (Note 9)	(5.3)		(5.3)
Stock options exercised (in shares)		20
Stock options exercised	0.1			0.1
Stock-based compensation	1.8			1.8
Ending balance (in shares) at Mar. 31, 2018		18,478
Balance at the end of the period at Mar. 31, 2018	412.2	$ 0.2	(71.1)	325.8	243.8	(86.5)
Beginning balance (in shares) at Dec. 31, 2018		18,597
Balance at the beginning of the period at Dec. 31, 2018	390.2	$ 0.2	(76.6)	328.5	243.2	(105.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11.8				11.8
Other comprehensive income, after income tax benefit	(1.7)					(1.7)
Dividends declared	(7.6)				(7.6)
Shares purchased (Note 9)	(0.3)		(0.3)
Stock options exercised (in shares)		9
Stock options exercised	0.0
Restricted stock vesting (in shares)		3
Restricted stock vesting (Note 9)	(0.1)		(0.1)
Stock-based compensation	1.9			1.9
Ending balance (in shares) at Mar. 31, 2019		18,609
Balance at the end of the period at Mar. 31, 2019	$ 394.2	$ 0.2	$ (77.0)	$ 330.4	$ 247.4	$ (106.8)