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
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Viatris Inc. common shareholders	$ 399.2	$ (1,037.6)
Weighted average shares outstanding	1,210.5	1,207.5
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	2.6	0.0
Total dilutive shares outstanding	1,213.1	1,207.5
Basic earnings (loss) per share attributable to Viatris Inc. shareholders	$ 0.33	$ (0.86)
Diluted earnings (loss) per ordinary share	$ 0.33	$ (0.86)