Earnings (Loss) per Ordinary 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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Viatris Inc. common shareholders	$ 354.3	$ 311.5	$ 1,067.4	$ (1,005.3)
Weighted average shares outstanding	1,212.5	1,209.3	1,211.8	1,208.6
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	5.6	3.3	4.3	0.0
Total dilutive shares outstanding	1,218.1	1,212.6	1,216.1	1,208.6
Basic earnings (loss) per share attributable to Viatris Inc. shareholders	$ 0.29	$ 0.26	$ 0.88	$ (0.83)
Diluted earnings (loss) per ordinary share	$ 0.29	$ 0.26	$ 0.88	$ (0.83)