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, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net earnings attributable to Viatris Inc. common shareholders	$ 113.9	$ 224.7
Weighted average shares outstanding	1,195.2	1,202.5
Basic earnings per share attributable to Viatris Inc. shareholders	$ 0.10	$ 0.19
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	14.3	3.1
Total dilutive shares outstanding	1,209.5	1,205.6
Diluted earnings (loss) per ordinary share	$ 0.09	$ 0.19