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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net (loss) earnings attributable to Viatris Inc. common shareholders	$ (326.4)	$ 264.0	$ (212.5)	$ 488.7
Weighted average shares outstanding	1,191.1	1,199.0	1,193.1	1,200.8
Basic (loss) earnings per share attributable to Viatris Inc. shareholders	$ (0.27)	$ 0.22	$ (0.18)	$ 0.41
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	0.0	4.5	0.0	3.8
Total dilutive shares outstanding	1,191.1	1,203.5	1,193.1	1,204.6
Diluted earnings (loss) per ordinary share	$ (0.27)	$ 0.22	$ (0.18)	$ 0.41