Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Par	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance at Dec. 31, 2019	$ 1,446.1	$ 1.1	$ 829.9	$ 1,978.9	$ (118.7)	$ (1,245.1)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	42.4			42.4
Dividends paid on common stock ($0.17 per share)	(14.2)			(14.2)
Change in other comprehensive loss – net of tax	(36.6)				(36.6)
Stock based compensation	8.0		15.2			(7.2)
Acquisition of treasury stock	(24.6)					(24.6)
Balance at Mar. 31, 2020	1,421.1	1.1	845.1	2,007.1	(155.3)	(1,276.9)
Balance at Dec. 31, 2020	1,510.2	1.1	849.7	1,996.4	(59.6)	(1,277.4)
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(14.0)			(14.0)
Change in other comprehensive loss – net of tax	(19.1)				(19.1)
Stock based compensation	9.8		11.8			(2.0)
Balance at Mar. 31, 2021	$ 1,486.9	$ 1.1	$ 861.5	$ 1,982.4	$ (78.7)	$ (1,279.4)