Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Jun. 27, 2015
Cash Flows From (For) Operating Activities
Net income (loss)	$ 42.5	$ 119.6	$ (4,012.8)	$ 136.1
Adjustments to derive cash flows
Depreciation and amortization	182.4	444.8	457.0	258.7
Loss on acquisition-related foreign currency derivatives	0.0	0.0	0.0	326.4
Share-based compensation	22.8	43.8	23.0	31.6
Impairment charges	215.6	47.5	2,631.0	6.8
Change in financial assets	(57.3)	24.9	2,608.2	(78.5)
Loss on extinguishment of debt	0.9	135.2	1.1	10.5
Restructuring charges	26.9	61.0	31.0	5.1
Deferred income taxes	(120.0)	(48.9)	(990.9)	(16.3)
Amortization of debt premium	(10.2)	(22.4)	(24.7)	0.2
Other non-cash adjustments, net	18.1	(2.7)	33.5	10.2
Subtotal	321.7	802.8	756.4	690.8
Increase (decrease) in cash due to:
Accounts receivable	52.5	3.2	(0.6)	(51.1)
Inventories	(29.6)	(16.0)	100.7	(11.4)
Accounts payable	(194.1)	(39.6)	(75.7)	120.5
Payroll and related taxes	(38.2)	(27.4)	(41.1)	(30.2)
Accrued customer programs	34.4	34.6	(13.9)	71.3
Accrued liabilities	108.1	(47.8)	(79.5)	42.8
Accrued income taxes	(56.8)	(6.1)	20.9	21.9
Other, net	2.9	(4.8)	(12.3)	0.6
Subtotal	(120.8)	(103.9)	(101.5)	164.4
Net cash from operating activities	200.9	698.9	654.9	855.2
Cash Flows From (For) Investing Activities
Proceeds from royalty rights	166.3	87.3	353.7	344.6
Acquisitions of businesses, net of cash acquired	(791.6)	(0.4)	(427.4)	(2,177.8)
Asset acquisitions	0.0	0.0	(65.1)	(4.0)
Settlement of acquisition-related foreign currency derivatives	(1.3)	0.0	0.0	(329.9)
Proceeds from sale of securities	0.0	0.0	4.5	0.0
Additions to property, plant and equipment	(77.8)	(88.6)	(106.2)	(137.0)
Net proceeds from sale of business and other assets	0.0	154.6	69.1	0.0
Proceeds from sale of the Tysabri® financial asset	0.0	2,200.0	0.0	0.0
Other investing, net	(3.7)	(14.8)	(3.6)	1.8
Net cash from (for) investing activities	(708.1)	2,338.1	(175.0)	(2,302.3)
Cash Flows From (For) Financing Activities
Borrowings (repayments) of revolving credit agreements and other financing, net	718.0	6.8	(802.5)	(54.0)
Issuances of long-term debt	0.0	0.0	1,190.3	2,504.3
Payments on long-term debt	(28.3)	(2,611.0)	(559.2)	(1,823.5)
Premium on early debt retirement	0.0	(116.1)	(0.6)	0.0
Deferred financing fees	(0.3)	(4.8)	(2.8)	(28.1)
Issuance of ordinary shares	4.9	0.7	8.3	1,043.5
Equity issuance costs	0.0	0.0	(10.3)	(35.7)
Repurchase of ordinary shares	(500.0)	(191.5)	0.0	0.0
Cash dividends	(36.3)	(91.1)	(83.2)	(64.8)
Other financing, net	(8.4)	2.3	(8.7)	(19.3)
Net cash from (for) financing activities	149.6	(3,004.7)	(268.7)	1,522.4
Effect of exchange rate changes on cash and cash equivalents	(10.2)	24.1	(6.7)	(89.2)
Net increase (decrease) in cash and cash equivalents	(367.8)	56.4	204.5	(13.9)
Cash and cash equivalents, beginning of period	785.6	622.3	417.8	799.5
Cash and cash equivalents, end of period	417.8	678.7	622.3	785.6
Cash paid/received during the year for:
Interest paid	84.2	187.6	205.1	143.2
Interest received	0.7	9.3	1.2	1.1
Income taxes paid	87.8	186.9	139.5	131.0
Income taxes refunded	$ 1.7	$ 3.6	$ 9.3	$ 9.6