Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Dec. 29, 2017	Mar. 16, 2018	Feb. 13, 2018
Income Taxes [Line Items]
Deferred tax benefit, intangible assets	$ (58,900,000)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	16,300,000
Deferred tax expense, Utilization of Tax Attributes		$ 74,300,000		$ 101,500,000
Income tax benefit	125,200,000	57,800,000	$ 222,000,000.0	153,400,000
Increase (decrease) tax benefit	67,400,000		68,600,000
Increase (Decrease) Tax Benefit, Intercompany Financing Reorganization	82,300,000		82,300,000
Increase (Decrease) Tax Expense (Benefit), Legal Reorganization		17,300,000		17,300,000
Increase (Decrease) Tax Expense (Benefit), U.S. Tax Reform Deferred Tax Liabilities Remeasurment Adjustment	9,100,000		(9,100,000)
Increase (Decrease) Tax Expense (Benefit) Due to Pension Settlement				18,100,000
Current Income Tax Expense (Benefit), Intercompany Financing Reorganziation	1,000,000.0
Deferred Income Tax Expense (Benefit), Intercompany Financing Reorganization	(83,300,000)
Increase (Decrease) Deferred Tax Asset, Tax Loss and Credit Carryforwards	67,000,000.0
Increase (Decrease) Deferred Tax Liabilities, Investment in Partnership	58,900,000
Increase (Decrease) Deferred Tax Liability Resulting From Tax Reform, TCJA					$ (444,800,000)
Loss (income) from continuing operations before income taxes	$ 22,200,000	$ 4,700,000	$ 190,100,000	$ 126,800,000
Effective tax rate	564.00%	1229.80%	116.80%	121.00%
Current Income Tax Expense (Benefit)	$ 16,100,000	$ (81,400,000)	$ 29,200,000	$ (13,600,000)
Deferred Income Tax Expense (Benefit)	(141,300,000)	23,600,000	(251,200,000)	(139,800,000)
Deferred Income Tax Expense (Benefit), Intangible Assets		50,700,000		241,300,000
Income Taxes Paid, Net			12,500,000		73,400,000
(Loss) income from discontinued operations, net of income taxes	10,800,000	10,600,000	79,500,000	499,100,000
Unrecognized tax benefits	192,300,000		192,300,000		182,500,000
Unrecognized tax benefits, net increase			9,800,000
Unrecognized tax benefits, net increase related to prior period tax positions			16,600,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			2,000,000.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations			4,800,000
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	179,500,000		179,500,000
Interest accrued on unrecognized tax benefits	18,000,000.0		18,000,000.0		$ 7,100,000
Unrecognized tax benefits that would impact effective tax rate, upper bound of change	34,200,000		34,200,000
Income tax penalties and interest accrued that would impact effective tax rate, upper bound of change	5,700,000		5,700,000
Increase (Decrease) Tax Expense (Benefit) Due to U.S. Tax Reform		36,700,000		70,000,000.0
Increase (Decrease) Foreign Tax Expense (Benefit) Due To Acquisitions	(3,700,000)		(11,800,000)
Increase (Decrease) Tax Expense (Benefit) Due to Divestiture				27,100,000
Increase (Decrease) Tax Expense (Benefit), Change in Operating Income	$ 8,300,000		$ (9,100,000)
Effective Income Tax Rate Reconciliation, Deduction, Percent, US Tax Reform TCJA	4100.00%		480.00%
Sucampo [Member]
Income Taxes [Line Items]
Increase (Decrease) Deferred Tax Asset, Net Operating Losses			$ 29,400,000
Deferred tax benefit, intangible assets			179,300,000
Increase (Decrease) Deferred Tax Liability, Inventory Step-Up			24,100,000
Increase (Decrease) Deferred Tax Asset, Net			3,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other							$ 170,200,000
Specialty Generics Disposal Group
Income Taxes [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	$ (13,500,000)	(37,800,000)	(82,700,000)	(179,800,000)
Income tax (benefit) expense	2,300,000	26,600,000	18,100,000	42,600,000
(Loss) income from discontinued operations, net of income taxes	11,200,000	11,200,000	64,600,000	137,200,000
Nuclear Imaging
Income Taxes [Line Items]
Other Tax Expense (Benefit)				900,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		600,000		(371,200,000)
Contingent Consideration Received, Cash, Discontinued Operation			6,000,000.0
Contingent consideration received, equity certificates			9,000,000.0
Income tax expense on contingent consideration received, discontinued operations			1,500,000
Income tax (benefit) expense		(100,000)		5,200,000
(Loss) income from discontinued operations, net of income taxes		$ (500,000)		$ 366,000,000.0
Hemostasis Products
Income Taxes [Line Items]
Increase (Decrease) in Deferred Tax Liability, Future Consideration			1,500,000
Increase (Decrease) Deferred Tax Asset, Net Operating Losses			(2,400,000)
Deferred tax benefit, intangible assets			4,200,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			(8,100,000)
Increase (Decrease) Deferred Tax Liability, Inventory Step-Up			(3,000,000.0)
Increase (Decrease), Deferred Tax Liability, Net						$ (3,000,000.0)
Discontinued Operations [Member]
Income Taxes [Line Items]
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	$ 20,000,000.0		$ 20,000,000.0