Comprehensive Earnings (Components Of Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain (loss) on marketable securities, net of tax, beginning of period			$ 10.1
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax	$ (0.5)		(0.5)		$ (0.5)	$ 4.3	$ 6.0
Foreign currency translation adjustment, beginning of period			(133.8)
Accumulated other comprehensive loss, net of tax, beginning of period			(361.2)
Net sales	2,827.3	$ 2,956.3	8,233.2	$ 8,570.2
Interest expense	136.2	131.8	407.1	406.3
Other comprehensive earnings (loss), available-for-sale securities adjustment, before tax	0.0	(8.9)	(0.1)	3.5
Change in unrecognized gain and prior service cost related to defined benefit plans	(6.8)	1.1	(8.3)	2.4
Other comprehensive (loss) earnings, before tax	(310.7)	338.6	(1,173.4)	1,663.8
Income tax provision (benefit)	15.5	91.3	(79.9)	124.2
Net unrealized gain (loss) on marketable securities, net of tax, end of period	0.0		0.0
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax, end of period	(0.5)		(0.5)
Foreign currency translation adjustment, end of period	(1,231.4)		(1,231.4)
Accumulated other comprehensive loss, net of tax, end of period	(1,490.9)		(1,490.9)
Gains and Losses on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized gains (losses) on derivatives, net of tax, beginning of period				(38.6)
Other comprehensive earnings (loss) before reclassifications, before tax		(4.4)		19.9
Income tax provision (benefit)		(2.8)		9.4
Net unrecognized gains (losses) on derivatives, net of tax, end of period		(18.8)		(18.8)
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax		(4.5)		29.2
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Earnings | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(0.9)	(2.0)	(8.1)	3.8
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Earnings | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.9	1.9	5.7	5.5
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				14.5
Other comprehensive earnings (loss) before reclassifications, before tax		(8.9)		3.5
Income tax provision (benefit)		(3.2)		1.4
Net unrealized gain (loss) on marketable securities, net of tax, end of period		16.6		16.6
Gains and Losses on Marketable Securities | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive earnings (loss), available-for-sale securities adjustment, before tax		(8.9)		3.5
Income tax provision (benefit)	0.0		0.0
Cumulative Effect of New Accounting Principle in Period of Adoption					(10.0)
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		1.4		1.4				$ (0.5)	$ (0.5)
Other comprehensive earnings (loss) before reclassifications, before tax	(7.0)	0.8	(8.7)	1.7
Income tax provision (benefit)		0.2		(0.5)
Net unrecognized losses and prior service cost related to defined benefit plans, net of tax, end of period		1.4		1.4
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs		(0.1)		(0.2)
Change in unrecognized gain and prior service cost related to defined benefit plans		(1.1)		2.4
Income tax provision (benefit)	(2.0)		(1.8)
Cumulative Effect of New Accounting Principle in Period of Adoption					0.0
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, beginning of period				(2,237.7)
Other comprehensive earnings (loss) before reclassifications, before tax	(270.8)		(1,097.6)
Income tax provision (benefit)		0.0		0.0
Foreign currency translation adjustment, end of period		(405.8)		(405.8)
Foreign Currency Translation Adjustment | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) earnings, before tax		423.0		1,831.9
Income tax provision (benefit)	0.0		0.0
Cumulative Effect of New Accounting Principle in Period of Adoption					0.0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net of tax, beginning of period				(2,263.7)
Other comprehensive earnings (loss) before reclassifications, before tax	(311.9)	338.4	(1,171.4)	1,653.8
Income tax provision (benefit)		(5.8)		11.3
Accumulated other comprehensive loss, net of tax, end of period		(611.2)		(611.2)
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	0.1	(0.1)	0.3	0.2
Other comprehensive earnings (loss), reclassification adjustment from AOCE, pension and other postretirement benefit plans, for net gain (loss), before tax	0.1	(0.2)	0.1	0.5
Income tax provision (benefit)	(19.1)		(51.2)
Cumulative Effect of New Accounting Principle in Period of Adoption					(7.5)
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Earnings | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(0.9)	(2.0)	(8.1)	3.8
AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Earnings | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.9	1.9	5.7	5.5
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax	(51.9)	(4.5)	(146.1)	29.2
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			(3.7)
Other comprehensive earnings (loss) before reclassifications, before tax	(52.9)		(143.7)
Income tax provision (benefit)	(18.0)		(50.4)
Net unrecognized gains (losses) on derivatives, net of tax, end of period	(96.9)		(96.9)
Cumulative Effect of New Accounting Principle in Period of Adoption					2.5
Cash Flow Hedging | Gains and Losses on Derivatives | Foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	(0.9)		(8.1)
Cash Flow Hedging | Gains and Losses on Derivatives | Interest rate swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	1.9		5.7
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					(162.1)	$ (180.0)	$ (239.8)
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax	18.8	(72.1)	78.7	(203.2)
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				(1.4)
Other comprehensive earnings (loss) before reclassifications, before tax		(72.1)		(203.2)
Income tax provision (benefit)	0.9	0.0	1.0	0.0
Net unrecognized gains (losses) on derivatives, net of tax, end of period		(204.6)		(204.6)
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 0.0
Mylan N.V.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	0.0	0.0	0.0	0.0
Interest expense	84.0	93.3	266.1	285.6
Other comprehensive earnings (loss), available-for-sale securities adjustment, before tax		(8.9)	(0.1)	3.5
Change in unrecognized gain and prior service cost related to defined benefit plans	(6.8)	1.1	(8.3)	2.4
Other comprehensive (loss) earnings, before tax	(310.7)	338.6	(1,173.4)	1,663.8
Income tax provision (benefit)	(8.0)	2.4	(23.3)	1.4
Mylan N.V. | Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrecognized losses on derivatives in net investment hedging relationships, net of tax	(51.9)	(4.5)	(146.1)	29.2
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	18.8	(72.1)	78.7	(203.2)
Pension and other postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	0.1	0.1	0.3	0.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(0.1)		(0.1)
Pension and other postretirement benefits | Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service costs	$ 0.1		$ 0.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (0.2)		$ (0.5)