Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 27, 2014	Dec. 31, 2017	Dec. 31, 2016	Jun. 27, 2015
Summary of Significant Accounting Policies [Line Items]
Customer related acruals and allowances	$ 489.4		$ 512.3	$ 484.3
Depreciation	53.8		95.2	100.2	$ 84.3
Property, Plant and Equipment, Gross [Abstract]
Land	47.5		45.5	45.0
Buildings	508.2		514.3	520.2
Machinery and equipment	1,103.3		1,078.6	1,094.7
Gross property, plant and equipment	1,659.0		1,638.4	1,659.9
Less accumulated depreciation	(772.8)		(805.3)	(789.8)
Property, plant and equipment, net	886.2		833.1	870.1	932.4
Research and development	88.2	$ 89.8	167.7	184.0	187.8
Advertising expense	$ 77.5		145.3	$ 155.9	$ 55.7
Cumulative Effect on Retained Earnings, Net of Tax			$ 5.4
CHCI
Property, Plant and Equipment, Gross [Abstract]
Omega advertising percentage			94.00%
Foreign currency forward contracts
Summary of Significant Accounting Policies [Line Items]
Maximum remaining maturity of foreign currency derivatives	18 months		18 months	18 months
Minimum
Summary of Significant Accounting Policies [Line Items]
Previous years fiscal period (in weeks)				365 days
Minimum | Machinery and Equipment
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			3 years
Minimum | Building
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			10 years
Maximum
Summary of Significant Accounting Policies [Line Items]
Previous years fiscal period (in weeks)				372 days
Maximum | Machinery and Equipment
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			20 years
Maximum | Building
Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life (in years)			45 years
Tysabri [Member]
Summary of Significant Accounting Policies [Line Items]
Accounts receivable	$ 83.4			$ 84.4