Recent Accounting Pronouncements Recent Accounting Pronouncements (Impact of Adoption - ASU 2014-09) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 2,250.6	$ 2,329.8	$ 6,747.5	$ 7,163.8
Income tax (benefit) provision	70.6	73.2	237.6	276.9
Net earnings attributable to Viatris Inc. common shareholders	331.6	354.3	820.3	1,067.4
Revenues	3,941.9	4,078.2	11,589.6	12,386.7
Prepaid expenses and other current assets	1,784.7		1,784.7			$ 1,811.2
Income taxes payable	206.9		206.9			279.6
Retained earnings	5,553.0		5,553.0			5,175.6
Accumulated other comprehensive loss	$ (3,208.5)	(3,759.1)	$ (3,208.5)	(3,759.1)	$ (3,005.6)	(2,761.2)	$ (2,899.2)
Amounts due for supplier finance program		$ 59.6		$ 59.6		$ 33.4