Comprehensive Earnings (Accumulated Other Comprehensive Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	$ (4,300,000)	$ 70,600,000	$ 21,000,000.0	$ 237,600,000
Net unrealized loss on available-for-sale fixed income securities, net of tax	(600,000)		(600,000)		$ (1,400,000)	$ (1,200,000)
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax	(262,500,000)		(262,500,000)		261,700,000	271,400,000
Foreign currency translation adjustment	(3,168,900,000)		(3,168,900,000)		(3,678,900,000)	(3,246,700,000)
Accumulated other comprehensive loss	(2,686,300,000)		(2,686,300,000)		(2,975,200,000)	(2,747,400,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(1,400,000)	4,900,000	10,400,000	10,400,000
Sales Revenue, Goods, Net	3,738,000,000	3,933,900,000	11,177,400,000	11,562,500,000
Interest expense	145,600,000	141,500,000	429,800,000	432,200,000
TSA income related to divestitures	10,200,000	92,000,000.0	143,200,000	269,400,000
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives	(38,000,000.0)	8,800,000	(600,000)
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	228,800,000		228,800,000		423,200,000	237,100,000
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		41,500,000		33,300,000
Accumulated other comprehensive loss		(3,208,500,000)		(3,208,500,000)			$ (3,005,600,000)	$ (2,761,200,000)
Other comprehensive earnings (loss) before reclassifications, before tax	231,200,000	(144,600,000)	82,600,000	(367,200,000)
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		2,200,000		12,400,000
Net unrecognized loss on derivatives in cash flow hedging relationships, net of tax		17,500,000		17,500,000			10,900,000	(18,500,000)
Other comprehensive earnings (loss) before reclassifications, before tax		23,400,000		77,400,000
Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	(9,700,000)		(500,000)
Net unrecognized loss on derivatives in cash flow hedging relationships, net of tax					$ 20,200,000	$ (8,000,000.0)
Other comprehensive earnings (loss) before reclassifications, before tax	(37,100,000)		13,700,000
Gains and Losses on Derivatives | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	(53,600,000)	40,300,000	(2,200,000)	23,300,000
Net unrecognized loss on derivatives in cash flow hedging relationships, net of tax		461,500,000		461,500,000			315,000,000.0	377,000,000.0
Other comprehensive earnings (loss) before reclassifications, before tax		186,800,000		107,800,000
Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		(100,000)		0
Net unrealized loss on available-for-sale fixed income securities, net of tax		(2,500,000)		(2,500,000)			(1,300,000)	(2,300,000)
Other comprehensive earnings (loss) before reclassifications, before tax		(1,300,000)		(200,000)
Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		900,000		2,400,000
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax		260,500,000		260,500,000			264,500,000	268,500,000
Other comprehensive earnings (loss) before reclassifications, before tax	5,200,000	(2,700,000)	800,000	7,400,000
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision		0		0
Foreign currency translation adjustment		(3,945,500,000)		(3,945,500,000)			$ (3,594,700,000)	$ (3,385,900,000)
Other comprehensive earnings (loss) before reclassifications, before tax	510,000,000.0		77,800,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	(62,400,000)		(4,000,000.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(500,000)		(1,600,000)	(100,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	4,300,000		12,800,000	14,900,000
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				48,400,000
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	300,000		200,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax (benefit) provision	600,000		(1,500,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax				10,400,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax				100,000
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		(350,800,000)		(559,600,000)
Mylan N.V. | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gain (loss) on derivatives			(10,500,000)	107,800,000
Foreign currency forward contracts | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Sales Revenue, Goods, Net	(5,900,000)		(22,500,000)
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	(5,900,000)	(15,800,000)	(22,500,000)	(32,500,000)
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	(5,900,000)	(15,800,000)	(22,500,000)	(32,500,000)
Interest rate swaps | Gains and Losses on Derivatives | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1,600,000		4,800,000
TSA income related to divestitures	3,400,000		3,400,000
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	1,200,000	4,800,000	3,500,000
TSA income related to divestitures	3,400,000		3,400,000
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	1,200,000	4,800,000	3,500,000
TSA income related to divestitures	3,400,000		3,400,000
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	(500,000)	(100,000)	(1,600,000)	(100,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	4,300,000	4,900,000	12,800,000	14,900,000
Other Comprehensive Income, Gain (Loss), Defined Benefit Plan, Divestiture Of Plan [Abstract]		2,600,000		$ (3,000,000.0)
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	$ (500,000)	$ (100,000)	$ (1,600,000)