Income Taxes (Details) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 29, 2017 USD ($)	Dec. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 25, 2017 USD ($)
Income Taxes [Line Items]
Deferred tax benefit, intangible assets	$ (45.5)			$ (232.8)
Deferred tax expense, Utilization of Tax Attributes	74.3			101.5
Income tax benefit	(31.2)		$ (56.4)	$ (110.8)	$ (218.3)
Other increase, percentage point				105.2
Increase (Decrease) Tax Expense (Benefit) Due to Foreign Tax Credit, Percentage Point				16.5
Loss (income) from continuing operations before income taxes	$ 33.1		$ 53.6	$ 53.0	$ 166.9
Effective tax rate	(94.30%)		(105.20%)	(209.10%)	(130.80%)
Current Income Tax Expense (Benefit)	$ (60.0)		$ 37.9	$ 20.5	$ 85.9
Deferred Income Tax Expense (Benefit)	$ 28.8		(94.3)	$ (131.3)	(304.2)
Increase (Decrease) in Effective Tax Rate, Percentage Point	10.9			(78.3)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percentage Point	109.4			68.2
Income Taxes Paid, Net		$ 95.6		$ 90.9		$ 165.4
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percentage Point	36.7			15.5
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percentage Point	(135.2)			(183.5)
Increase (Decrease) Effective Tax Rate, Divestitures, Percentage Point				5.0
Income Tax Expense (Benefit), Legal Reorganization	$ 36.1
Unrecognized tax benefits	123.0	118.7		$ 123.0
Unrecognized tax benefits, net increase				4.3
Unrecognized tax benefits, net decreases related to prior period tax positions				(1.7)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations				(2.7)
Unrecognized tax benefits, additions related to current year tax positions				8.7
Unrecognized tax benefits, which if favorably settled would benefit the effective tax rate	121.3			121.3
Interest accrued on unrecognized tax benefits	6.8	7.1		6.8
Unrecognized tax benefits that would impact effective tax rate, upper bound of change	(30.2)			(30.2)
Income tax penalties and interest accrued that would impact effective tax rate, upper bound of change	(4.4)			(4.4)
Stratatech
Income Taxes [Line Items]
Increase (Decrease), Deferred Tax Liability, Net	22.1	$ 24.3		22.1
InfaCare Acquisition
Income Taxes [Line Items]
Deferred Tax Liabilities, Net							$ 20.3
Deferred Tax Assets, Net							8.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent							$ 11.3
Nuclear Imaging
Income Taxes [Line Items]
Other Tax Expense (Benefit)				0.9
Income tax (benefit) expense	(0.1)		$ 24.8	5.2	$ 43.8
Intrathecal Therapy
Income Taxes [Line Items]
Increase (Decrease) in Deferred Tax Liability, Future Consideration				56.5
Increase (Decrease) Deferred Tax Asset, Net Operating Losses				(2.3)
Deferred tax benefit, intangible assets				(17.9)
Increase (Decrease) Deferred Tax Asset, Product Development				2.6
Increase (Decrease) Deferred Tax Asset, Net				(0.6)
Increase (Decrease), Deferred Tax Liability, Net	$ 38.9			$ 38.9
Retained Earnings | ASU 2016-16
Income Taxes [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted				75.0
Retained Earnings | ASU 2016-09
Income Taxes [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted				2.9
Other Assets | ASU 2016-16
Income Taxes [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted				67.2
Prepaid Expenses and Other Current Assets | ASU 2016-16
Income Taxes [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted				7.8