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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net earnings $ (1,269.1) $ (669.9) $ 16.8
Weighted average common shares outstanding 1,208.8 601.2 515.7
Basic (loss) earnings per share attributable to Viatris Inc. shareholders $ (1.05) $ (1.11) $ 0.03
Weighted average number diluted shares outstanding adjustment, stock-based awards and warrants 0.0 0.0 0.8
Total dilutive shares outstanding 1,208.8 601.2 516.5
Diluted (loss) earnings per share attributable to Viatris Inc. shareholders $ (1.05) $ (1.11) $ 0.03
Retained Earnings      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net earnings $ (1,269.1) $ (669.9) $ 16.8