Comprehensive Earnings (Components Of Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain (loss) on marketable securities, net of tax, beginning of period	$ 1.2
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax	26.3		$ 26.3	$ (26.1)
Foreign currency translation adjustment, beginning of period	(461.5)
Accumulated other comprehensive loss, net of tax, beginning of period	(858.0)
Net sales	4,400.1	$ 2,588.2
Interest expense	169.0	119.9
Net unrealized (loss) gain on marketable securities	(0.9)	0.2
Change in unrecognized gain and prior service cost related to defined benefit plans	0.8	(1.6)
Other comprehensive loss, before tax	(490.6)	(667.1)
Income Tax Expense (Benefit)	596.3	9.9
Net unrealized gain (loss) on marketable securities, net of tax, end of period	0.2
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax, end of period	26.3
Foreign currency translation adjustment, end of period	(1,182.7)
Accumulated other comprehensive loss, net of tax, end of period	(1,385.6)
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gains (losses) on derivatives, net of tax, beginning of period		(31.6)
Other comprehensive earnings (loss) before reclassifications, before tax		(52.4)
Income Tax Expense (Benefit)		(12.9)
Net unrecognized gains (losses) on derivatives, net of tax, end of period		(70.1)
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax		(51.4)
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(6.1)	(0.1)
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.1	1.1
Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain (loss) on marketable securities, net of tax, beginning of period		0.6
Other comprehensive earnings (loss) before reclassifications, before tax		0.2
Income Tax Expense (Benefit)		0.0
Net unrealized gain (loss) on marketable securities, net of tax, end of period		0.8
Gains and Losses on Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Expense (Benefit)	0.1
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		(19.0)			$ (17.4)
Other comprehensive earnings (loss) before reclassifications, before tax	0.6	(1.8)
Income Tax Expense (Benefit)		0.0
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax, end of period		(19.0)
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in unrecognized gain and prior service cost related to defined benefit plans		(1.6)
Income Tax Expense (Benefit)	1.0
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, beginning of period		(1,674.5)
Other comprehensive earnings (loss) before reclassifications, before tax	(721.2)
Income Tax Expense (Benefit)		0.0
Foreign currency translation adjustment, end of period		(2,331.1)
Foreign Currency Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss, before tax		(656.6)
Income Tax Expense (Benefit)	0.0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net of tax, beginning of period		(1,797.2)
Other comprehensive earnings (loss) before reclassifications, before tax	(485.8)	(668.3)
Income Tax Expense (Benefit)		(10.8)
Accumulated other comprehensive loss, net of tax, end of period		(2,453.5)
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	(0.1)
Other comprehensive earnings (loss), reclassification adjustment from AOCE, pension and other postretirement benefit plans, for net gain (loss), before tax	0.3	0.2
Income Tax Expense (Benefit)	37.0
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(6.1)	(0.1)
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.1	1.1
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax	3.3
Net unrecognized gain (loss) on derivatives	3.3	(51.4)
Cash Flow Hedging | Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gains (losses) on derivatives, net of tax, beginning of period	(18.0)
Other comprehensive earnings (loss) before reclassifications, before tax	8.3
Income Tax Expense (Benefit)	0.8
Net unrecognized gains (losses) on derivatives, net of tax, end of period	(15.5)
Cash Flow Hedging | Gains and Losses on Derivatives | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(6.1)
Cash Flow Hedging | Gains and Losses on Derivatives | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.1
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			$ (161.3)	$ (353.6)
Net unrecognized gain (loss) on derivatives	227.4	42.3
Net Investment Hedging | Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gains (losses) on derivatives, net of tax, beginning of period		(74.3)
Other comprehensive earnings (loss) before reclassifications, before tax		42.3
Income Tax Expense (Benefit)	35.1	2.1
Net unrecognized gains (losses) on derivatives, net of tax, end of period		(34.1)
Mylan N.V. | Net Investment Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax	227.4	42.3
Pension and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	(0.1)	0.0
Recognized net actuarial losses	0.3	$ 0.2
Pension and other postretirement benefits | Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	$ (0.1)