CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury	Noncontrolling Interest
Total stockholders' equity, Beginning of Period at Dec. 31, 2018	$ 861.0	$ 0.8	$ 797.3	$ 749.0	$ (284.8)	$ (401.8)	$ 0.5
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2018		69,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(66.6)			(66.6)
Other Comprehensive Income (Loss) – net of tax	(2.3)				(2.3)
Issuance of Common Stock (in shares)		700,000
Issuance of Common Stock	21.4		21.4
Compensation under Stock-based Plans - net (in shares)		100,000
Compensation under Stock-based Plans - net	(23.0)		(24.7)			1.7
Dividends	(7.9)		0.1	(8.0)
Acquisition of Treasury Stock	(0.3)					(0.3)
Acquisition of Treasury Stock (in shares)		0
Shares outstanding, End of Period (in shares) at Mar. 31, 2019		70,400,000
Total stockholders' equity, End of Period at Mar. 31, 2019	782.3	$ 0.8	794.1	674.4	(287.1)	(400.4)	0.5
Total stockholders' equity, Beginning of Period at Dec. 31, 2018	861.0	$ 0.8	797.3	749.0	(284.8)	(401.8)	0.5
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2018		69,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	29.9
Shares outstanding, End of Period (in shares) at Sep. 30, 2019		70,600,000
Total stockholders' equity, End of Period at Sep. 30, 2019	866.3	$ 0.8	812.6	754.9	(300.3)	(401.7)	0.0
Total stockholders' equity, Beginning of Period at Mar. 31, 2019	782.3	$ 0.8	794.1	674.4	(287.1)	(400.4)	0.5
Shares oustanding, Beginning of Period (in shares) at Mar. 31, 2019		70,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	75.1			75.1
Other Comprehensive Income (Loss) – net of tax	(0.2)				(0.2)
Issuance of Common Stock	1.5		1.5
Compensation under Stock-based Plans - net	11.8		11.7			0.1
Dividends	(7.8)		0.2	(8.0)
Acquisition of Treasury Stock	(2.1)					(2.1)
Acquisition of Treasury Stock (in shares)		0
Shares outstanding, End of Period (in shares) at Jun. 30, 2019		70,400,000
Total stockholders' equity, End of Period at Jun. 30, 2019	860.6	$ 0.8	807.5	741.5	(287.3)	(402.4)	0.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21.4			21.4
Other Comprehensive Income (Loss) – net of tax	(13.0)				(13.0)		0.0
Issuance of Common Stock (in shares)		200,000
Issuance of Common Stock	4.2		4.2
Compensation under Stock-based Plans - net	1.7		0.7			1.0
Dividends	(7.8)		0.2	(8.0)
Acquisition of Treasury Stock	(0.3)					(0.3)
Acquisition of Treasury Stock (in shares)		0
Noncontrolling Interest, Decrease from Deconsolidation	(0.5)						(0.5)
Shares outstanding, End of Period (in shares) at Sep. 30, 2019		70,600,000
Total stockholders' equity, End of Period at Sep. 30, 2019	866.3	$ 0.8	812.6	754.9	(300.3)	(401.7)	0.0
Total stockholders' equity, Beginning of Period at Dec. 31, 2019	932.3	$ 0.8	824.4	771.4	(257.5)	(406.8)	0.0
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2019		70,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(24.9)			(24.9)
Other Comprehensive Income (Loss) – net of tax	(56.2)				(56.2)
Issuance of Common Stock (in shares)		600,000
Issuance of Common Stock	26.5	$ 0.1	26.4
Compensation under Stock-based Plans - net (in shares)		100,000
Compensation under Stock-based Plans - net	(26.3)		(29.5)			3.2
Dividends	(8.4)		0.2	(8.6)
Acquisition of Treasury Stock	(54.9)					(54.9)
Acquisition of Treasury Stock (in shares)		(2,500,000)
Other	(1.9)			(1.9)
Shares outstanding, End of Period (in shares) at Mar. 31, 2020		68,600,000
Total stockholders' equity, End of Period at Mar. 31, 2020	786.2	$ 0.9	821.5	736.0	(313.7)	(458.5)	0.0
Total stockholders' equity, Beginning of Period at Dec. 31, 2019	932.3	$ 0.8	824.4	771.4	(257.5)	(406.8)	0.0
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2019		70,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (28.3)
Acquisition of Treasury Stock (in shares)	(2,500,000)
Shares outstanding, End of Period (in shares) at Sep. 30, 2020		68,600,000
Total stockholders' equity, End of Period at Sep. 30, 2020	$ 852.7	$ 0.9	832.2	732.6	(253.9)	(459.1)	0.0
Total stockholders' equity, Beginning of Period at Mar. 31, 2020	786.2	$ 0.9	821.5	736.0	(313.7)	(458.5)	0.0
Shares oustanding, Beginning of Period (in shares) at Mar. 31, 2020		68,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(9.2)			(9.2)
Other Comprehensive Income (Loss) – net of tax	18.9				18.9
Issuance of Common Stock (in shares)		100,000
Issuance of Common Stock	0.6		0.6
Compensation under Stock-based Plans - net	4.8		4.7			0.1
Acquisition of Treasury Stock	(1.0)					(1.0)
Acquisition of Treasury Stock (in shares)		(100,000)
Other	0.1			0.1
Shares outstanding, End of Period (in shares) at Jun. 30, 2020		68,600,000
Total stockholders' equity, End of Period at Jun. 30, 2020	800.4	$ 0.9	826.8	726.9	(294.8)	(459.4)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5.8			5.8
Other Comprehensive Income (Loss) – net of tax	40.9				40.9
Issuance of Common Stock	0.7		0.7
Compensation under Stock-based Plans - net	5.1		4.7			0.4
Acquisition of Treasury Stock	(0.1)					(0.1)
Other	(0.1)			(0.1)
Shares outstanding, End of Period (in shares) at Sep. 30, 2020		68,600,000
Total stockholders' equity, End of Period at Sep. 30, 2020	$ 852.7	$ 0.9	$ 832.2	$ 732.6	$ (253.9)	$ (459.1)	$ 0.0