Earnings per Share (Basic and Diluted Earnings Per Ordinary Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net earnings attributable to Viatris Inc. common shareholders	$ 331.6	$ 354.3	$ 820.3	$ 1,067.4
Weighted average shares outstanding				1,211.8
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	8.1	5.6	5.2	4.3
Total dilutive shares outstanding				1,216.1
Basic earnings per share attributable to Viatris Inc. shareholders	$ 0.28	$ 0.29	$ 0.68	$ 0.88
Diluted earnings (loss) per ordinary share	$ 0.27	$ 0.29	$ 0.68	$ 0.88