Comprehensive Earnings (Accumulated Other Comprehensive Loss) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	$ (65,400,000)	$ 69,000,000.0	$ 25,300,000	$ 167,000,000.0
Net unrealized loss on available-for-sale fixed income securities, net of tax	(1,400,000)		(1,400,000)		$ (1,400,000)	$ (1,200,000)
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax	(261,700,000)		(261,700,000)		266,400,000	271,400,000
Foreign currency translation adjustment	(3,678,900,000)		(3,678,900,000)		(3,589,200,000)	(3,246,700,000)
Accumulated other comprehensive loss	(2,975,200,000)		(2,975,200,000)		(2,941,000,000)	(2,747,400,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	5,600,000	6,800,000	11,800,000	5,500,000
Sales Revenue, Goods, Net	3,785,900,000	3,909,500,000	7,439,400,000	7,628,600,000
Interest expense	145,800,000	143,700,000	284,200,000	290,700,000
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives	8,700,000	36,800,000	37,400,000
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	423,200,000		423,200,000		369,600,000	237,100,000
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		4,300,000		(8,200,000)
Accumulated other comprehensive loss		(3,005,600,000)		(3,005,600,000)			$ (2,764,600,000)	$ (2,761,200,000)
Other comprehensive earnings (loss) before reclassifications, before tax	(6,200,000)	(219,400,000)	(148,600,000)	(222,600,000)
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		9,100,000		10,200,000
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax		10,900,000		10,900,000			(16,800,000)	(18,500,000)
Other comprehensive earnings (loss) before reclassifications, before tax		43,500,000		54,000,000.0
Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	2,100,000		9,200,000
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax					$ 13,600,000	$ (8,000,000.0)
Other comprehensive earnings (loss) before reclassifications, before tax	17,100,000		50,800,000
Gains and Losses on Derivatives | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	14,800,000	(2,700,000)	51,400,000	(17,000,000.0)
Net unrecognized gain (loss) on derivatives in cash flow hedging relationships, net of tax		315,000,000.0		315,000,000.0			325,100,000	377,000,000.0
Other comprehensive earnings (loss) before reclassifications, before tax		(12,800,000)		(79,000,000.0)
Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		(100,000)		100,000
Net unrealized loss on available-for-sale fixed income securities, net of tax		(1,300,000)		(1,300,000)			(1,600,000)	(2,300,000)
Other comprehensive earnings (loss) before reclassifications, before tax		200,000		1,100,000
Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		2,000,000.0		1,500,000
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax		264,500,000		264,500,000			269,300,000	268,500,000
Other comprehensive earnings (loss) before reclassifications, before tax	(2,000,000.0)	3,800,000	(4,400,000)	10,100,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		0		0
Foreign currency translation adjustment		(3,594,700,000)		(3,594,700,000)			$ (3,340,600,000)	$ (3,385,900,000)
Other comprehensive earnings (loss) before reclassifications, before tax	(89,700,000)		(432,200,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	16,000,000.0		58,400,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(600,000)		(1,100,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	4,200,000		8,500,000	10,000,000.0
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				39,600,000
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		(100,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	(900,000)		(2,100,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax				5,500,000
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
Other Comprehensive Income (Loss), before Tax		(254,100,000)		(208,800,000)
Mylan N.V. | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives			237,500,000	(79,000,000.0)
Foreign currency forward contracts | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sales Revenue, Goods, Net	(10,000,000.0)		(16,600,000)
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	(10,000,000.0)	(7,800,000)	(16,600,000)	(16,700,000)
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	(10,000,000.0)	(7,800,000)	(16,600,000)	(16,700,000)
Interest rate swaps | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1,600,000		3,200,000
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	1,600,000	1,100,000	3,200,000	2,300,000
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	1,600,000	1,100,000	3,200,000	2,300,000
Pension and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(600,000)	0	(1,100,000)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	4,200,000	5,000,000.0	8,500,000	10,000,000.0
Other Comprehensive Income, Gain (Loss), Defined Benefit Plan, Divestiture Of Plan [Abstract]		$ (5,600,000)		$ (5,600,000)
Pension and other postretirement benefits | 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, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	$ (600,000)		$ (1,100,000)