STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	[CommonStockMember]	Additional Paid-in Capital [Member]	[RetainedEarningsMember]	[TreasuryStockMember]	[AccumulatedOtherComprehensiveIncomeMember]	[NoncontrollingInterestMember]
Total Stockholders' Equity at Dec. 31, 2020	$ 641.4	$ 12.7	$ 1,625.5	$ 106.5	$ 0.0	$ (1,223.6)	$ 120.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	8.4			(8.4)			16.8
Other comprehensive income	64.2					62.5	1.7
Employee stock plans	11.6	0.0	16.4	0.0	(4.8)
Total Stockholders' Equity at Sep. 30, 2021	680.2	12.7	1,592.1	102.5	(4.8)	(1,161.1)	138.8
Total Stockholders' Equity at Jun. 30, 2021	606.1	12.7	1,587.5	53.8	(4.7)	(1,176.3)	133.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	55.2			48.7			6.5
Other comprehensive income	14.4					15.2	(0.8)
Employee stock plans	4.5	0.0	4.6	0.0	(0.1)
Total Stockholders' Equity at Sep. 30, 2021	680.2	12.7	1,592.1	102.5	(4.8)	(1,161.1)	138.8
Total Stockholders' Equity at Dec. 31, 2021	832.7	12.7	1,596.7	72.7	(4.8)	(991.7)	147.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	65.3			54.0			11.3
Other comprehensive income	63.4					81.8	(18.4)
Purchase of treasury stock	(104.9)				(104.9)
Conversion of convertible notes	82.5	0.3	45.4	(26.7)	63.5
Dividends paid to noncontrolling interest	(16.0)						(16.0)
Sale of subsidiary shares to noncontrolling interest	0.9						0.9
Employee stock plans	14.5	0.1	20.1	0.0	(5.7)
Total Stockholders' Equity at Sep. 30, 2022	938.4	13.1	1,662.2	100.0	(51.9)	(909.9)	124.9
Total Stockholders' Equity at Jun. 30, 2022	893.9	13.1	1,656.6	38.9	(36.8)	(908.9)	131.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	64.4			61.1			3.3
Other comprehensive income	(10.4)					(1.0)	(9.4)
Purchase of treasury stock	(15.0)				(15.0)
Employee stock plans	5.5	0.0	5.6	0.0	(0.1)
Total Stockholders' Equity at Sep. 30, 2022	$ 938.4	$ 13.1	$ 1,662.2	$ 100.0	$ (51.9)	$ (909.9)	$ 124.9