Consolidated Condensed Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Employee Benefit Trust	Accumulated Other Comprehensive Loss	Common Stock in Treasury	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018			1,057,639					604
Beginning balance at Dec. 31, 2018			$ 661.0	$ 6,583.6	$ 11,395.9	$ (3,013.2)	$ (5,729.2)	$ (69.4)	$ 1,080.4
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income					4,241.6				22.2
Other comprehensive income (loss), net of tax							41.7		11.0
Retirement of treasury shares (in shares)			(89,197)					(89,197)
Retirement of treasury shares			$ (55.7)		(10,771.8)			$ 10,827.5
Purchase of treasury shares (in shares)								24,196
Purchase of treasury shares				(700.0)				$ (2,800.0)
Issuance of stock under employee stock plans, net (in shares)			2,921					(63)
Issuance of stock under employee stock plans, net			$ 1.8	(202.8)				$ 7.3
Stock-based compensation				75.8
Acquisition of common stock in exchange offer (in shares)								65,001
Acquisition of common stock in exchange offer								$ (8,027.5)
Deconsolidation of Elanco									(1,028.9)
Other					13.7
Ending balance (in shares) at Mar. 31, 2019			971,363					541
Ending balance at Mar. 31, 2019			$ 607.1	5,756.6	4,879.4	(3,013.2)	(5,687.5)	$ (62.1)	84.7
Beginning balance (in shares) at Dec. 31, 2019			958,056					530
Beginning balance at Dec. 31, 2019		$ 2,699.1	$ 598.8	6,685.3	4,920.4	(3,013.2)	(6,523.6)	$ (60.8)	92.2
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income					1,456.5				26.2
Other comprehensive income (loss), net of tax							(362.3)
Retirement of treasury shares (in shares)			(3,627)					(3,627)
Retirement of treasury shares			$ (2.3)		(497.7)			$ 500.0
Purchase of treasury shares (in shares)	[1]							3,627
Purchase of treasury shares	[1]							$ (500.0)
Issuance of stock under employee stock plans, net (in shares)			2,500					(43)
Issuance of stock under employee stock plans, net			$ 1.6	(201.0)				$ 5.1
Stock-based compensation				71.8
Other					0.2
Ending balance (in shares) at Mar. 31, 2020			956,929					487
Ending balance at Mar. 31, 2020		$ 3,197.2	$ 598.1	$ 6,556.1	$ 5,879.4	$ (3,013.2)	$ (6,885.9)	$ (55.7)	$ 118.4

[1] ⁽¹⁾ As of March 31, 2020, there was $1.00 billion remaining under our $8.00 billion share repurchase program authorized in June 2018.