CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - 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, 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, 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	23.5
Other comprehensive income, after income tax benefit	(0.7)
Ending balance (in shares) at Sep. 30, 2018		18,533
Balance at the end of the period at Sep. 30, 2018	399.1	$ 0.2	(72.1)	328.2	237.3	(94.5)
Beginning balance (in shares) at Mar. 31, 2018		18,478
Balance at the beginning of the period at Mar. 31, 2018	412.2	$ 0.2	(71.1)	325.8	243.8	(86.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(4.8)				(4.8)
Other comprehensive income, after income tax benefit	(8.4)					(8.4)
Dividends declared	(6.9)				(6.9)
Shares purchased (Note 9)	(1.0)		(1.0)
Stock options exercised (in shares)		12
Stock options exercised	0.3			0.3
Restricted stock vesting (in shares)		8
Restricted stock vesting (Note 9)	0.0
Stock-based compensation	1.2			1.2
Other/currency	(0.1)			(0.1)
Ending balance (in shares) at Jun. 30, 2018		18,498
Balance at the end of the period at Jun. 30, 2018	392.5	$ 0.2	(72.1)	327.2	232.1	(94.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12.1				12.1
Other comprehensive income, after income tax benefit	0.4					0.4
Dividends declared	(6.9)				(6.9)
Stock options exercised (in shares)		35
Stock options exercised	0.3			0.3
Stock-based compensation	0.7			0.7
Ending balance (in shares) at Sep. 30, 2018		18,533
Balance at the end of the period at Sep. 30, 2018	399.1	$ 0.2	(72.1)	328.2	237.3	(94.5)
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)
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	39.8
Other comprehensive income, after income tax benefit	(1.3)
Ending balance (in shares) at Sep. 30, 2019		18,635
Balance at the end of the period at Sep. 30, 2019	405.5	$ 0.2	(81.7)	333.3	260.1	(106.4)
Beginning balance (in shares) at Mar. 31, 2019		18,609
Balance at the beginning of the period at Mar. 31, 2019	394.2	$ 0.2	(77.0)	330.4	247.4	(106.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13.6				13.6
Other comprehensive income, after income tax benefit	6.2					6.2
Dividends declared	(7.6)				(7.6)
Shares purchased (Note 9)	(1.6)		(1.6)
Stock options exercised (in shares)		1
Stock options exercised	0.0
Restricted stock vesting (in shares)		21
Restricted stock vesting (Note 9)	0.0
Stock-based compensation	1.7			1.7
Ending balance (in shares) at Jun. 30, 2019		18,631
Balance at the end of the period at Jun. 30, 2019	406.5	$ 0.2	(78.6)	332.1	253.4	(100.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	14.4				14.4
Other comprehensive income, after income tax benefit	(5.8)					(5.8)
Dividends declared	(7.7)				(7.7)
Shares purchased (Note 9)	(2.9)		(2.9)
Stock options exercised (in shares)		2
Stock options exercised	0.0
Restricted stock vesting (in shares)		2
Restricted stock vesting (Note 9)	(0.2)		(0.2)
Stock-based compensation	1.2			1.2
Ending balance (in shares) at Sep. 30, 2019		18,635
Balance at the end of the period at Sep. 30, 2019	$ 405.5	$ 0.2	$ (81.7)	$ 333.3	$ 260.1	$ (106.4)