Statements of Changes in Consolidated Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 2,193.2	$ 12.7	$ 1,618.0	$ 1,679.3	$ (18.2)	$ (1,201.7)	$ 103.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,559.6)			(1,572.6)			13.0
Other comprehensive income (loss)	(10.5)					(21.9)	11.4
Equity component of convertible note	49.8		49.8
Convertible note capped call	(19.4)		(19.4)
Dividends paid to noncontrolling interest	$ (7.2)						(7.2)
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06
Employee Stock Plans	$ (4.9)		(22.9)	(0.2)	18.2
Ending balance 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)	(16.2)			(38.2)			22.0
Other comprehensive income (loss)	236.7					231.9	4.8
Employee Stock Plans	16.2		21.0		(4.8)
Ending balance 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)	146.5			130.9			15.6
Other comprehensive income (loss)	248.2					266.5	(18.3)
Purchase of treasury stock	(139.9)				(139.9)
Conversion of convertible notes	82.5	0.3	45.4	(26.7)	63.5
Dividends paid to noncontrolling interest	(34.0)						(34.0)
Sales of subsidiary shares to noncontrolling interest	0.9						0.9
Employee Stock Plans	20.3	0.1	26.0	0.0	(5.8)
Ending balance at Dec. 31, 2022	$ 1,157.2	$ 13.1	$ 1,668.1	$ 176.9	$ (87.0)	$ (725.2)	$ 111.3