Consolidated Condensed Statements of Equity - 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
Balance at beginning of period 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 (loss)					5,568.8				21.1
Other comprehensive income (loss), net of tax							128.7		11.0
Cash dividend declared					(1,178.1)
Retirement of treasury shares (in shares)			(94,627)					(94,627)
Retirement of treasury shares			$ (59.1)		(11,468.5)			$ 11,527.5
Purchase of treasury shares (in shares)								29,626
Purchase of treasury shares								$ (3,500.0)
Issuance of stock under employee stock plans, net (in shares)			2,945					(63)
Issuance of stock under employee stock plans, net			$ 1.8	(204.4)				$ 7.3
Stock-based compensation				155.3
Acquisition of common stock in exchange offer								$ (8,027.5)
Acquisition of common stock in exchange offer (in shares)								65,001
Deconsolidation of Elanco									(1,028.9)
Other									(6.8)
Ending balance (in shares) at Jun. 30, 2019			965,957					541
Balance at end of period at Jun. 30, 2019			$ 603.7	6,534.5	4,318.1	(3,013.2)	(5,600.5)	$ (62.1)	76.8
Beginning balance (in shares) at Mar. 31, 2019			971,363					541
Balance at beginning of period at Mar. 31, 2019			$ 607.1	5,756.6	4,879.4	(3,013.2)	(5,687.5)	$ (62.1)	84.7
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)					1,327.2				(1.1)
Other comprehensive income (loss), net of tax							87.0
Cash dividend declared					(1,178.1)
Retirement of treasury shares (in shares)			(5,430)					(5,430)
Retirement of treasury shares			$ (3.4)		(696.6)			$ 700.0
Purchase of treasury shares (in shares)								5,430
Purchase of treasury shares				700.0				$ (700.0)
Issuance of stock under employee stock plans, net (in shares)			24
Issuance of stock under employee stock plans, net				(1.6)
Stock-based compensation				79.5
Other					(13.8)				(6.8)
Ending balance (in shares) at Jun. 30, 2019			965,957					541
Balance at end of period at Jun. 30, 2019			$ 603.7	6,534.5	4,318.1	(3,013.2)	(5,600.5)	$ (62.1)	76.8
Beginning balance (in shares) at Dec. 31, 2019			958,056					530
Balance at beginning of period 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 (loss)					2,868.5				100.7
Other comprehensive income (loss), net of tax							(159.3)
Cash dividend declared					(674.0)
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)			2,524					(43)
Issuance of stock under employee stock plans, net			$ 1.6	(204.1)				$ 5.1
Stock-based compensation				148.6
Other				(0.4)					(13.8)
Ending balance (in shares) at Jun. 30, 2020			956,953					487
Balance at end of period at Jun. 30, 2020		4,272.0	$ 598.1	6,629.4	6,617.2	(3,013.2)	(6,682.9)	$ (55.7)	179.1
Beginning balance (in shares) at Mar. 31, 2020			956,929					487
Balance at beginning of period at Mar. 31, 2020			$ 598.1	6,556.1	5,879.4	(3,013.2)	(6,885.9)	$ (55.7)	118.4
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)					1,412.0				74.5
Other comprehensive income (loss), net of tax							203.0
Cash dividend declared					(674.0)
Issuance of stock under employee stock plans, net (in shares)			24
Issuance of stock under employee stock plans, net				(3.1)
Stock-based compensation				76.8
Other				(0.4)	(0.2)				(13.8)
Ending balance (in shares) at Jun. 30, 2020			956,953					487
Balance at end of period at Jun. 30, 2020		$ 4,272.0	$ 598.1	$ 6,629.4	$ 6,617.2	$ (3,013.2)	$ (6,682.9)	$ (55.7)	$ 179.1

[1] As of June 30, 2020, there was $1.00 billion remaining under our $8.00 billion share repurchase program authorized in June 2018.