Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Sep. 25, 2017	Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015	Dec. 11, 2017	Aug. 31, 2016	Feb. 01, 2016	Apr. 16, 2015
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		20.00%	19.00%	20.00%	20.00%
Increase (Decrease) Tax Expense (Benefit), Change in Operating Income			$ 23.4	$ 146.3
Increase (Decrease) Foreign Tax Expense (Benefit) Due To Acquisitions				32.0
Increase (Decrease) Tax Expense (Benefit) Due to Amortization of Intangible Assets				56.8
Increase (Decrease) Tax Benefit, Jurisdiction Rate Difference			29.4	(96.4)
Increase (Decrease) Tax Expense (Benefit), Other				25.1
Deferred income taxes		$ 2,398.1	689.0
Tax Credit Carryforward Utilization					$ 14.3
Income Taxes Paid, Net		95.6	73.4	165.4	123.8
Increase (Decrease) Deferred Tax Liability Resulting from Divestiture			38.9
Operating Loss Carryforwards					7.0
Income Tax Holiday, Aggregate Dollar Amount		0.0	1.8	1.0	5.1
Decrease in Unrecognized Tax Benefits is Reasonably Possible			38.4
Income Tax Benefit, TCJA, discrete			456.9
Increase (Decrease) Deferred Tax Liability Resulting From Tax Reform, TCJA			444.8
Significant Change in Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued That Would Impact Effective Tax Rate, Estimated Range of Change, Upper Bound			4.9
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		7.1	7.1	7.2	41.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		116.9	180.8	113.1	87.4
Unrecognized Tax Benefits, Interest on Income Taxes Expense		0.0	2.6	4.1	5.7
Tax Credit Carryforward, Amount			24.1
Increase (Decrease) Deferred Tax Liability Resulting From Legal Reorganization			1,122.3
Increase (Decrease) Deferred Tax Liability Resulting From Tax Reform			444.8
Increase (Decrease) Deferred Tax Liability Resulting from Installment Note Payments			(270.6)
Increase (Decrease), Deferred Tax Liability Due to Amortization of Intangible Assets			63.6
Increase (Decrease), Deferred Tax Assets Due to Rebate Reserves			47.0
Increase (Decrease) Deferred Tax Assets Resulting from Legal Settlements			37.5
Increase (Decrease) Deferred Tax Liability Resulting from Acquisitions			29.7
Increase (Decrease) Deferred Tax Liability Resulting from Pension Activity			29.6
Increase (Decrease) Deferred Tax Liability Resulting from Continuing Operations			9.5
Tax Credit Carryforwards, Not Subject to Expiration			2.4
Increase (Decrease) Tax Expense (Benefit) Due to Divestiture			37.6
Increase (Decrease) Tax Expense (Benefit) Due to U.S. Tax Reform			15.2
Hemostasis Products
Income Tax Contingency [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent								$ 2.1
InfaCare [Member]
Income Tax Contingency [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	$ 8.7
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	4.7
Increase (Decrease), Deferred Tax Liability, Net	8.7
Increase (Decrease) in Deferred Tax Liability, Intangible Assets	$ 13.8
Ikaria
Income Tax Contingency [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent									$ 620.5
Operating Loss Carryforwards					4.8
Tax Credit Carryforward, Amount					7.2
Stratatech [Member]
Income Tax Contingency [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			22.1				$ 22.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liability, Non-Current, Preliminary							$ 24.3
Ocera [Member]
Income Tax Contingency [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent						$ 23.2
Increase (Decrease) in Deferred Tax Liability, Intangible Assets			23.2
Intrathecal Therapy [Member]
Income Tax Contingency [Line Items]
Increase (Decrease), Deferred Tax Assets, Other			0.5
Increase (Decrease) Deferred Tax Liability Resulting from Divestiture			38.9
Increase (Decrease) Deferred Tax Liability Resulting from Future Consideration			56.4
Deferred Tax Assets, Operating Loss Carryforwards			2.3
Increase (Decrease) in Deferred Tax Liability, Intangible Assets			16.6
Increase (Decrease) Deferred Tax Assets Resulting from Committed Product Developments			$ 2.7
U.S. Federal and State Jursidictions [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax years that remain subject to examination			2010
U.S. Federal and State Jursidictions [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Tax years that remain subject to examination			2009
IRELAND
Income Tax Contingency [Line Items]
Tax years that remain subject to examination			2013
Non-U.K.
Income Tax Contingency [Line Items]
Tax Credit Carryforward Utilization		2.0	$ 5.6	9.5
Operating Loss Carry back			27.2
Operating Loss Carryforwards		$ 0.3	57.2	29.2
Deferred Tax Assets, Operating Loss Carryforwards			1,604.0
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration			1,489.9
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration			114.1
Non-U.K. | Hemostasis Products
Income Tax Contingency [Line Items]
Operating Loss Carryforwards				17.9
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Cash Advance Paid in Connection with Proposed Settlement, Interest Payment					1.5
Unrecognized Tax Benefits, Cash Advance Paid in Connection with Proposed Settlement, Tax Payment					7.4
Unrecognized Tax Benefits, Cash Advance Paid in Connection with Proposed Settlement					$ 8.9
U.K.
Income Tax Contingency [Line Items]
Operating Loss Carryforwards			14.3	$ 1.0
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration			106.4
Tax Cut and Jobs Act [Member]
Income Tax Contingency [Line Items]
Increase (Decrease) Net Operating Loss			6.2
Retained Earnings [Member] | Accounting Standards Update 2016-16 [Member]
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 75.0
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted			2.9
Other Assets [Member] | Accounting Standards Update 2016-16 [Member]
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (67.2)
Prepaid Expenses and Other Current Assets [Member] | Accounting Standards Update 2016-16 [Member]
Income Tax Contingency [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (7.8)