Recent Accounting Pronouncements Recent Accounting Pronouncements (Impact of Adoption - ASU 2014-09) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 2,292.0	$ 2,250.6	$ 6,802.6	$ 6,747.5
Income tax (benefit) provision	(4.3)	70.6	21.0	237.6
Net earnings (loss) attributable to Viatris Inc. common shareholders	94.8	331.6	(117.7)	820.3
Revenues	3,751.2	$ 3,941.9	11,211.2	$ 11,589.6
Prepaid expenses and other current assets	1,627.0		1,627.0			$ 2,028.1
Income taxes payable	284.1		284.1			226.8
Retained earnings	4,082.0		4,082.0			4,639.7
Accumulated other comprehensive loss	$ (2,686.3)		$ (2,686.3)		$ (2,975.2)	$ (2,747.4)