Subsidiary Guarantors Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			$ 449.2	$ 292.1	$ 614.9
Restricted Cash and Cash Equivalents			53.9	77.8	135.9
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$ 1,705.6	$ 1,569.3
Cash flows from investing activities:
Capital expenditures	(137.4)	(156.4)
Purchase of available for sale securities and other investments	(49.4)	(8.9)
Proceeds from the sale of assets	0.0	31.1
Proceeds from the sale of marketable securities	72.1	8.9
Cash paid for acquisitions, net	(65.9)	(71.6)
Investments in affiliates	0.0	0.0
Dividends from affiliates	0.0	0.0
Loans to affiliates	0.0	0.0
Repayments of loans from affiliates	0.0	0.0
Payments for product rights and other, net	(854.2)	(558.8)
Net cash used in investing activities	(1,034.8)	(755.7)
Cash flows from financing activities:
Payments of financing fees	(20.8)	(8.7)
Purchase of ordinary shares	(432.0)	0.0
Change in short-term borrowings, net	(45.9)	(48.3)
Proceeds from issuance of long-term debt	2,577.7	555.8
Payments of long-term debt	(2,598.6)	(1,747.3)
Proceeds from exercise of stock options	15.6	12.8
Taxes paid related to net share settlement of equity awards	(10.1)	(7.4)
Contingent consideration payments	(0.2)	(10.1)
Capital contribution from affiliates	0.0	0.0
Capital payments to affiliates	0.0	0.0
Payments on borrowings from affiliates	0.0	0.0
Proceeds from borrowings from affiliates	0.0	0.0
Other items, net	(0.4)	(0.7)
Net cash used in financing activities	(514.7)	(1,253.9)
Effect on cash of changes in exchange rates	(22.9)	44.1
Net increase (decrease) in cash, cash equivalents and restricted cash	133.2	(396.2)
Cash, cash equivalents and restricted cash — beginning of period	369.9	1,147.0
Cash, cash equivalents and restricted cash — end of period	503.1	750.8
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	369.9	1,147.0	503.1	369.9	750.8	$ 750.8
Eliminations
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			0.0	0.0	0.0
Restricted Cash and Cash Equivalents			0.0	0.0	0.0
Cash flows from operating activities:
Net cash (used in) provided by operating activities	0.0	0.0
Cash flows from investing activities:
Capital expenditures	0.0	0.0
Purchase of available for sale securities and other investments	0.0	0.0
Proceeds from the sale of assets		0.0
Proceeds from the sale of marketable securities	0.0	0.0
Cash paid for acquisitions, net	0.0	0.0
Investments in affiliates	22.0	21.1
Dividends from affiliates	(65.3)	(168.1)
Loans to affiliates	5,047.7	3,065.8
Repayments of loans from affiliates	(5,015.8)	(2,010.3)
Payments for product rights and other, net	0.0	0.0
Net cash used in investing activities	(11.4)	908.5
Cash flows from financing activities:
Payments of financing fees	0.0	0.0
Purchase of ordinary shares	0.0
Change in short-term borrowings, net	0.0	0.0
Proceeds from issuance of long-term debt	0.0	0.0
Payments of long-term debt	0.0	0.0
Proceeds from exercise of stock options	0.0	0.0
Taxes paid related to net share settlement of equity awards	0.0	0.0
Contingent consideration payments	0.0	0.0
Capital contribution from affiliates	(22.0)	(21.1)
Capital payments to affiliates	65.3	168.1
Payments on borrowings from affiliates	(5,047.7)	2,010.3
Proceeds from borrowings from affiliates	5,015.8	(3,065.8)
Other items, net	0.0	0.0
Net cash used in financing activities	11.4	(908.5)
Effect on cash of changes in exchange rates	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0
Cash, cash equivalents and restricted cash — beginning of period	0.0	0.0
Cash, cash equivalents and restricted cash — end of period	0.0	0.0
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0	0.0
Mylan N.V.
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			0.0	0.0	0.0
Restricted Cash and Cash Equivalents			0.0	0.0	0.0
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(68.6)	(175.1)
Cash flows from investing activities:
Capital expenditures	0.0	0.0
Purchase of available for sale securities and other investments	0.0	0.0
Proceeds from the sale of assets		0.0
Proceeds from the sale of marketable securities	0.0	0.0
Cash paid for acquisitions, net	0.0	(71.6)
Investments in affiliates	0.0	0.0
Dividends from affiliates	65.3	168.1
Loans to affiliates	(470.6)	(143.7)
Repayments of loans from affiliates	1,810.8	1,066.4
Payments for product rights and other, net	0.0	0.0
Net cash used in investing activities	1,405.5	1,019.2
Cash flows from financing activities:
Payments of financing fees	(0.5)	(8.3)
Purchase of ordinary shares	(432.0)
Change in short-term borrowings, net	0.0	0.0
Proceeds from issuance of long-term debt	496.5	554.5
Payments of long-term debt	(1,446.5)	(1,500.0)
Proceeds from exercise of stock options	15.6	12.8
Taxes paid related to net share settlement of equity awards	(10.1)	(7.4)
Contingent consideration payments	0.0	0.0
Capital contribution from affiliates	0.0	0.0
Capital payments to affiliates	0.0	0.0
Payments on borrowings from affiliates	1,314.0	0.0
Proceeds from borrowings from affiliates	(1,273.9)	104.0
Other items, net	0.0	0.0
Net cash used in financing activities	(1,336.9)	(844.4)
Effect on cash of changes in exchange rates	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	(0.3)
Cash, cash equivalents and restricted cash — beginning of period	0.0	0.3
Cash, cash equivalents and restricted cash — end of period	0.0	0.0
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	0.0	0.3	0.0	0.0	0.0
Mylan Inc.
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			27.1	0.2	82.2
Restricted Cash and Cash Equivalents			0.0	23.6	73.1
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(1,201.6)	(338.8)
Cash flows from investing activities:
Capital expenditures	(17.8)	(31.4)
Purchase of available for sale securities and other investments	0.0	0.0
Proceeds from the sale of assets		0.0
Proceeds from the sale of marketable securities	36.3	0.0
Cash paid for acquisitions, net	0.0	0.0
Investments in affiliates	(22.0)	(21.1)
Dividends from affiliates	0.0	0.0
Loans to affiliates	0.0	(364.1)
Repayments of loans from affiliates	0.0	0.3
Payments for product rights and other, net	(0.4)	(0.3)
Net cash used in investing activities	(3.9)	(416.6)
Cash flows from financing activities:
Payments of financing fees	(20.2)	(0.4)
Purchase of ordinary shares	0.0
Change in short-term borrowings, net	0.0	0.0
Proceeds from issuance of long-term debt	2,079.2	0.0
Payments of long-term debt	(1,150.0)	0.0
Proceeds from exercise of stock options	0.0	0.0
Taxes paid related to net share settlement of equity awards	0.0	0.0
Contingent consideration payments	0.0	0.0
Capital contribution from affiliates	0.0	0.0
Capital payments to affiliates	0.0	0.0
Payments on borrowings from affiliates	3,309.9	(1,664.4)
Proceeds from borrowings from affiliates	(3,010.1)	2,497.5
Other items, net	0.0	(7.4)
Net cash used in financing activities	1,208.8	825.3
Effect on cash of changes in exchange rates	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	3.3	69.9
Cash, cash equivalents and restricted cash — beginning of period	23.8	85.4
Cash, cash equivalents and restricted cash — end of period	27.1	155.3
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	23.8	85.4	27.1	23.8	155.3
Guarantor Subsidiaries
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			0.0	0.0	0.0
Restricted Cash and Cash Equivalents			0.0	0.0	0.0
Cash flows from operating activities:
Net cash (used in) provided by operating activities	0.0	0.0
Cash flows from investing activities:
Capital expenditures	0.0	0.0
Purchase of available for sale securities and other investments	0.0	0.0
Proceeds from the sale of assets		0.0
Proceeds from the sale of marketable securities	0.0	0.0
Cash paid for acquisitions, net	0.0	0.0
Investments in affiliates	0.0	0.0
Dividends from affiliates	0.0	0.0
Loans to affiliates	0.0	0.0
Repayments of loans from affiliates	0.0	0.0
Payments for product rights and other, net	0.0	0.0
Net cash used in investing activities	0.0	0.0
Cash flows from financing activities:
Payments of financing fees	0.0	0.0
Purchase of ordinary shares	0.0
Change in short-term borrowings, net	0.0	0.0
Proceeds from issuance of long-term debt	0.0	0.0
Payments of long-term debt	0.0	0.0
Proceeds from exercise of stock options	0.0	0.0
Taxes paid related to net share settlement of equity awards	0.0	0.0
Contingent consideration payments	0.0	0.0
Capital contribution from affiliates	0.0	0.0
Capital payments to affiliates	0.0	0.0
Payments on borrowings from affiliates	0.0	0.0
Proceeds from borrowings from affiliates	0.0	0.0
Other items, net	0.0	0.0
Net cash used in financing activities	0.0	0.0
Effect on cash of changes in exchange rates	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0
Cash, cash equivalents and restricted cash — beginning of period	0.0	0.0
Cash, cash equivalents and restricted cash — end of period	0.0	0.0
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries
Condensed Consolidating Cash Flow Statements [Line Items]
Cash and cash equivalents			422.1	291.9	532.7
Restricted Cash and Cash Equivalents			53.9	54.2	62.8
Cash flows from operating activities:
Net cash (used in) provided by operating activities	2,975.8	2,083.2
Cash flows from investing activities:
Capital expenditures	(119.6)	(125.0)
Purchase of available for sale securities and other investments	(49.4)	(8.9)
Proceeds from the sale of assets		31.1
Proceeds from the sale of marketable securities	35.8	8.9
Cash paid for acquisitions, net	(65.9)	0.0
Investments in affiliates	0.0	0.0
Dividends from affiliates	0.0	0.0
Loans to affiliates	(4,577.1)	(2,558.0)
Repayments of loans from affiliates	3,205.0	943.6
Payments for product rights and other, net	(853.8)	(558.5)
Net cash used in investing activities	(2,425.0)	(2,266.8)
Cash flows from financing activities:
Payments of financing fees	(0.1)	0.0
Purchase of ordinary shares	0.0
Change in short-term borrowings, net	(45.9)	(48.3)
Proceeds from issuance of long-term debt	2.0	1.3
Payments of long-term debt	(2.1)	(247.3)
Proceeds from exercise of stock options	0.0	0.0
Taxes paid related to net share settlement of equity awards	0.0	0.0
Contingent consideration payments	(0.2)	(10.1)
Capital contribution from affiliates	22.0	21.1
Capital payments to affiliates	(65.3)	(168.1)
Payments on borrowings from affiliates	423.8	(345.9)
Proceeds from borrowings from affiliates	(731.8)	464.3
Other items, net	(0.4)	6.7
Net cash used in financing activities	(398.0)	(326.3)
Effect on cash of changes in exchange rates	(22.9)	44.1
Net increase (decrease) in cash, cash equivalents and restricted cash	129.9	(465.8)
Cash, cash equivalents and restricted cash — beginning of period	346.1	1,061.3
Cash, cash equivalents and restricted cash — end of period	476.0	595.5
Supplemental Cash Flow Elements [Abstract]
Cash, cash equivalents and restricted cash	$ 346.1	$ 1,061.3	$ 476.0	$ 346.1	$ 595.5