Summary of Significant Accounting Policies (Basic And Diluted Earnings Per Ordinary Share Attributable To Mylan N.V.) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 2,078.6	$ (1,269.1)	$ (669.9)
Weighted average common shares outstanding	1,212.1	1,208.8	601.2
Basic earnings (loss) per share attributable to Viatris Inc. shareholders	$ 1.71	$ (1.05)	$ (1.11)
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants	5.3	0.0	0.0
Total dilutive shares outstanding	1,217.4	1,208.8	601.2
Diluted earnings (loss) per share attributable to Viatris Inc. shareholders	$ 1.71	$ (1.05)	$ (1.11)
Retained Earnings
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 2,078.6	$ (1,269.1)	$ (669.9)