Summary of Significant Accounting Policies (Basic And Diluted Earnings Per Ordinary Share Attributable To Mylan N.V.) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 27, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net earnings (loss) attributable to Viatris Inc. common shareholders		$ 54.7	$ 2,078.6	$ (1,269.1)
Weighted average shares outstanding (in shares)				1,208.8
Basic earnings (loss) per share attributable to Viatris Inc. shareholders (in dollars per share)		$ 0.05	$ 1.71	$ (1.05)
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants (in shares)		6.6	5.3	0.0
Total dilutive shares outstanding				1,208.8
Diluted earnings (loss) per share attributable to Viatris Inc. shareholders (in dollars per share)		$ 0.05	$ 1.71	$ (1.05)
Shares repurchased during the period (in shares)	21.2
Retained Earnings
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net earnings (loss) attributable to Viatris Inc. common shareholders		$ 54.7	$ 2,078.6	$ (1,269.1)