Subsidiary Guarantors (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 358.9	$ 388.1	$ 449.2
Restricted cash, included in prepaid expenses and other current assets	15.5	1.2	53.9
Cash, cash equivalents and restricted cash	374.4	389.3	503.1	$ 369.9
Equity method investments	$ 0.0	0.0
2021 Senior Notes (3.150% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	3.15%
2026 Senior Notes (3.950% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	3.95%
2046 Senior Notes (5.250% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	5.25%
2023 Senior Notes (3.125% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	3.125%
2023 Senior Notes (4.200% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	4.20%
SeniorNotesTwoThousandTwentyEight [Member] \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	4.55%
2043 Senior Notes (5.400% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	5.40%
2019 Senior Notes (2.500% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	2.50%
2020 Senior Notes (3.750% coupon) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	3.75%
2048 Senior Notes (5.200%) \| Senior Notes
Debt Instrument, Interest Rate, Stated Percentage	5.20%
Mylan N.V.
Cash and cash equivalents	$ 0.0	0.0	0.0
Restricted cash, included in prepaid expenses and other current assets	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0
Equity method investments	18,278.3	18,995.9
Mylan Inc.
Cash and cash equivalents	4.4	18.2	27.1
Restricted cash, included in prepaid expenses and other current assets	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	4.4	18.2	27.1	23.8
Equity method investments	12,844.7	13,129.5
Guarantor Subsidiaries
Cash and cash equivalents	0.0	0.0	0.0
Restricted cash, included in prepaid expenses and other current assets	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0
Equity method investments	0.0	0.0
Non-Guarantor Subsidiaries
Cash and cash equivalents	354.5	369.9	422.1
Restricted cash, included in prepaid expenses and other current assets	15.5	1.2	53.9
Cash, cash equivalents and restricted cash	370.0	371.1	476.0	346.1
Equity method investments	0.0	0.0
Eliminations
Cash and cash equivalents	0.0	0.0	0.0
Restricted cash, included in prepaid expenses and other current assets	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	$ 0.0	$ 0.0
Equity method investments	$ (31,123.0)	$ (32,125.4)

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