Statements of Consolidated Stockholders' Equity (Unaudited) - USD ($) $ in Millions		Total	Common Stock	Additional Paid in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance (shares) at Dec. 31, 2018			16,234,603
Beginning balance at Dec. 31, 2018		$ 740.4	$ 0.2	$ 1,059.3	$ 150.2	$ (420.5)	$ (48.8)
Stockholders' Equity [Roll Forward]
Net income		28.0			28.0
Other comprehensive income (loss), net of tax		9.7					9.7
Issuance of common shares to employees upon vesting of restricted stock units and performance shares (shares)			122,309
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)			(46,388)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(5.0)		(5.0)
Repurchase of common stock (shares)	[1]		(175,977)
Repurchase of common stock2	[1]	(17.4)				(17.4)
Cash dividends declared3	[2]	(10.2)			(10.2)
Amortization of unearned equity compensation		2.4		2.4
Ending balance (shares) at Mar. 31, 2019			16,134,547
Ending balance at Mar. 31, 2019		$ 747.9	$ 0.2	1,056.7	168.0	(437.9)	(39.1)
Beginning balance (shares) at Dec. 31, 2019		15,868,304	15,868,304
Beginning balance at Dec. 31, 2019		$ 733.9	$ 0.2	1,062.9	172.8	(463.4)	(38.6)
Stockholders' Equity [Roll Forward]
Net income		29.1			29.1
Other comprehensive income (loss), net of tax		(15.5)					(15.5)
Issuance of common shares to employees upon vesting of restricted stock units and performance shares (shares)			119,598
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)			(45,545)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares		(4.3)		(4.3)
Repurchase of common stock (shares)	[3]		(152,763)
Repurchase of common stock2	[3]	(12.5)				(12.5)
Cash dividends declared3	[4]	(11.3)			(11.3)
Amortization of unearned equity compensation		$ 1.7		1.7
Ending balance (shares) at Mar. 31, 2020		15,789,594	15,789,594
Ending balance at Mar. 31, 2020		$ 721.1	$ 0.2	$ 1,060.3	$ 190.6	$ (475.9)	$ (54.1)

[1] Weighted-average repurchase price (dollars per share) for the quarter ended March 31, 2019 was $98.55.

[2] Dividends declared per common share were $0.60 for the quarter ended March 31, 2019.

[3] Weighted-average repurchase price (dollars per share) for the quarter ended March 31, 2020 was $81.94. At March 31, 2020, $93.1 million remained available to repurchase our common shares pursuant to the stock repurchase program.

[4] Dividends declared per common share was $0.67 for the quarter ended March 31, 2020.