Comprehensive Earnings (Accumulated Other Comprehensive Loss) (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	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on marketable securities, net of tax	$ (2.5)	$ (2.7)	$ (2.5)	$ (2.7)	$ (1.3)	$ (2.3)	$ (2.1)
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax	(260.5)	(29.2)	(260.5)	(29.2)	264.5	268.5	30.1
Foreign currency translation adjustment	(3,945.5)	(4,584.5)	(3,945.5)	(4,584.5)	(3,594.7)	(3,385.9)	(3,421.5)
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)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	4.9	1.2	10.4	3.3
Sales Revenue, Goods, Net	3,933.9	4,067.4	11,562.5	12,351.0
Interest expense	141.5	153.2	432.2	445.3
Other Comprehensive Income, Gain (Loss), Defined Benefit Plan, Divestiture Of Plan	2.6		(3.0)
Net unrealized loss on marketable securities	(1.3)	(0.8)	(0.2)	(3.5)
Income tax (benefit) provision	70.6	73.2	237.6	276.9
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives	8.8	15.7	48.4
Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulate Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Net Investment Hedges, Effect Net of Taxx	461.5	764.4	461.5	764.4	315.0	377.0	471.6
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss		(3,759.1)		(3,759.1)				$ (1,744.3)
Other comprehensive earnings (loss) before reclassifications, before tax	(144.6)	(741.7)	(367.2)	(1,722.2)
Income tax (benefit) provision				221.8
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax		34.5		34.5				9.2
Other comprehensive earnings (loss) before reclassifications, before tax				104.6
Income tax (benefit) provision				8.2
Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax					$ 10.9	$ (18.5)	$ 22.7
Other comprehensive earnings (loss) before reclassifications, before tax	23.4	46.7	77.4
Income tax (benefit) provision	2.2	3.9	12.4
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	17.5	34.5	17.5	34.5
Gains and Losses on Derivatives | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax		764.4		764.4				16.7
Other comprehensive earnings (loss) before reclassifications, before tax				962.4
Income tax (benefit) provision	40.3	83.9	23.3	214.7
Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized loss on marketable securities, net of tax		(2.7)		(2.7)				0.0
Other comprehensive earnings (loss) before reclassifications, before tax				(3.5)
Income tax (benefit) provision				(0.8)
Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax		29.2		29.2				32.2
Other comprehensive earnings (loss) before reclassifications, before tax	(2.7)	(1.3)	7.4	(3.6)
Income tax (benefit) provision				0.3
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment		(4,584.5)		(4,584.5)				$ (1,802.4)
Other comprehensive earnings (loss) before reclassifications, before tax	(350.8)	(1,163.0)	(559.6)
Income tax (benefit) provision				0.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	4.9		14.9	(0.1)
Income tax (benefit) provision	41.5	87.3	33.3
Amortization of prior service costs	0.1	0.1	0.1	0.2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives				33.5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	(0.1)	(0.2)	0.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax				3.3
Income tax (benefit) provision	(0.9)	(0.3)	(2.4)
Amortization of prior service costs		(0.1)		(0.2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	0.0	0.0	0.0
Mylan N.V. | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives		376.7	107.8	962.4
Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive earnings (loss) before reclassifications, before tax	122.7	(82.7)	135.9	(7.9)
Foreign currency forward contracts | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sales Revenue, Goods, Net	(15.8)	(32.2)	(32.5)
Foreign currency forward contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sales Revenue, Goods, Net	(15.8)	(32.2)	(32.5)	(74.5)
Foreign currency forward contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sales Revenue, Goods, Net	(15.8)	(32.2)	(32.5)	(74.5)
Interest rate swaps | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.2	1.2	3.5
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.2	1.2	3.5	3.4
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.2	1.2	3.5	3.4
Pension and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Gain (Loss), Defined Benefit Plan, Divestiture Of Plan	2.6		(3.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	4.9	0.0	14.9	(0.1)
Amortization of prior service costs	0.1	$ 0.1	0.1	$ 0.2
Pension and other postretirement benefits | Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	$ 0.1		$ 0.1