Recent Accounting Pronouncements Recent Accounting Pronouncements (Impact of Adoption - ASU 2014-09) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Item Effected [Line Items]
Cost of sales	$ 3,303.0	$ 1,713.1
Income tax (benefit) provision	596.3	9.9
Net (loss) earnings attributable to Viatris Inc. common shareholders	(1,037.6)	20.8
Revenues	4,430.3	$ 2,619.2
Prepaid expenses and other current assets	2,040.4		$ 1,707.4
Income taxes payable	752.0		288.6
Retained earnings	4,323.6		5,361.2
Accumulated other comprehensive loss	$ (1,385.6)		$ (858.0)