CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ 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, 2017	$ 1,222.5	$ 1.3	$ 1,322.0	$ 1,995.9	$ (239.5)	$ (1,857.7)	$ 0.5
Shares oustanding, Beginning of Period (in shares) at Dec. 31, 2017		80.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	113.7			113.7
Other comprehensive income (loss) – net of tax	(42.7)				(42.7)
Issuance of Common Stock	17.3		17.3
Issuance of Common Stock (in shares)		0.8
Compensation under Stock-based Plans - net	8.0		6.3			1.7
Compensation under Stock-based Plans - net (in shares)		0.1
Dividends	(30.0)		0.9	(30.9)
Retirement of treasury stock	0.0	$ (0.5)	(549.2)	(1,332.3)		1,882.0
Acquisition of Treasury Stock (in shares)		(11.5)
Acquisition of Treasury Stock	(427.8)					(427.8)
Other	0.0			2.6	(2.6)
Shares outstanding, End of Period (in shares) at Dec. 31, 2018		69.6
Total stockholders' equity, End of Period at Dec. 31, 2018	861.0	$ 0.8	797.3	749.0	(284.8)	(401.8)	0.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	54.4			54.4
Other comprehensive income (loss) – net of tax	27.3				27.3
Issuance of Common Stock	27.8		27.8
Issuance of Common Stock (in shares)		0.9
Compensation under Stock-based Plans - net	1.4		(1.3)			2.7
Compensation under Stock-based Plans - net (in shares)		0.1
Dividends	(31.4)		0.6	(32.0)
Acquisition of Treasury Stock (in shares)		(0.2)
Acquisition of Treasury Stock	(7.7)					(7.7)
Divestiture	(0.5)						(0.5)
Shares outstanding, End of Period (in shares) at Dec. 31, 2019		70.4
Total stockholders' equity, End of Period at Dec. 31, 2019	932.3	$ 0.8	824.4	771.4	(257.5)	(406.8)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(10.6)			(10.6)
Other comprehensive income (loss) – net of tax	49.1				49.1
Issuance of Common Stock	29.1	$ 0.1	29.0
Issuance of Common Stock (in shares)		0.7
Compensation under Stock-based Plans - net	(12.0)		(15.7)			3.7
Compensation under Stock-based Plans - net (in shares)		0.1
Dividends	(8.4)		0.2	(8.6)
Acquisition of Treasury Stock (in shares)		(2.6)
Acquisition of Treasury Stock	(56.1)					(56.1)
Other	(1.9)			(1.9)
Shares outstanding, End of Period (in shares) at Dec. 31, 2020		68.6
Total stockholders' equity, End of Period at Dec. 31, 2020	$ 921.5	$ 0.9	$ 837.9	$ 750.3	$ (208.4)	$ (459.2)	$ 0.0