Post Employment Plans - Net Periodic Pension Cost (Details) - USD ($) $ in Millions		6 Months Ended				12 Months Ended
		Dec. 31, 2015		Jun. 28, 2014		Jun. 27, 2015		Jun. 28, 2014		Jun. 29, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		$ 135.0		$ 89.0	[1]	$ 140.3		$ 89.0	[1]
Defined Benefit Plan, Fair Value of Plan Assets		134.9		99.6	[1]	133.3	[1]	99.6	[1]
Defined Benefit Plan, Funded Status of Plan		(0.1)				(7.0)	[1]
Defined Benefit Plan, Contributions by Employer		3.3				2.4	[1]
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		3.2				49.9	[1]
Defined Benefit Plan, Service Cost		2.2				0.9	[1]	0.0	[2]
Interest cost		1.7				2.4	[1]	1.4	[2]
Actuarial loss		(10.1)				(6.8)	[1]
Defined Benefit Plan, Expected Return on Plan Assets		(1.8)				(2.7)	[1]	(1.9)	[2]
Net actuarial (gain)/loss		0.4				1.0	[1]	0.7	[2]
Net periodic pension cost		2.5				1.6	[1]	0.2	[2]
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		5.6				70.4	[1]
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)		0.6				0.9	[1]
Defined Benefit Plan, Settlements, Benefit Obligation		0.0				0.0	[1]
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		(4.1)				(14.7)	[1]
Defined Benefit Plan, Actual Return on Plan Assets		(0.6)				(1.0)	[1]
Defined Benefit Plan, Benefits Paid		(0.6)				(0.1)	[1]
Defined Benefit Plan, Purchases, Sales, and Settlements		0.0				0.0	[1]
Postretirement Medical Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		7.0		4.6	[1]	6.0	[1]	4.6	[1]	$ 3.9
Defined Benefit Plan, Fair Value of Plan Assets		0.0				0.0	[1]			0.0	[1]
Defined Benefit Plan, Funded Status of Plan				(4.6)		(6.0)	[1]	(4.6)
Defined Benefit Plan, Contributions by Employer		0.0						0.0	[1]
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		0.0						0.0	[1]
Defined Benefit Plan, Service Cost		0.3				0.3	[1]	0.5
Interest cost		0.1				0.2	[1]	0.3
Actuarial loss		(0.5)						0.0	[1]
Defined Benefit Plan, Expected Return on Plan Assets		0.0				0.0	[1]	0.6
Net actuarial (gain)/loss		0.0				0.1	[1]
Net periodic pension cost		0.4				0.6	[1]	1.4
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		0.0				1.0	[1]	0.0
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)		0.1				0.1	[1]	0.1
Defined Benefit Plan, Settlements, Benefit Obligation		0.0						0.0	[1]
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		0.1						0.0	[1]
Defined Benefit Plan, Actual Return on Plan Assets		0.0						0.0	[1]
Defined Benefit Plan, Benefits Paid		0.0						0.0	[1]
Defined Benefit Plan, Purchases, Sales, and Settlements		0.0						0.0	[1]
Ireland
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation				89.0	[2]	140.3	[1]	89.0	[2]	$ 0.0	[2]
Defined Benefit Plan, Fair Value of Plan Assets		0.0	[2]	99.6	[2]	133.3		99.6	[2]
Defined Benefit Plan, Funded Status of Plan	[2]			10.6				10.6
Defined Benefit Plan, Contributions by Employer	[2]							0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	[2]							107.3
Defined Benefit Plan, Service Cost	[2]							0.0
Interest cost	[2]							1.4
Actuarial loss	[2]							(12.1)
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[2]							84.4
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	[2]							0.2
Defined Benefit Plan, Settlements, Benefit Obligation	[2]							8.0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[2]			(0.7)
Defined Benefit Plan, Actual Return on Plan Assets	[2]							5.4
Defined Benefit Plan, Benefits Paid	[2]							(0.2)
Defined Benefit Plan, Purchases, Sales, and Settlements	[2]							12.1
Other Noncurrent Assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan		16.5		10.6	[2]	12.8	[1]	10.6	[2]
Other Noncurrent Assets [Member] | Postretirement Medical Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan		0.0		0.0		0.0	[1]	0.0
Other Noncurrent Liabilities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan		(16.6)		0.0	[2]	(19.8)	[1]	0.0	[2]
Other Noncurrent Liabilities [Member] | Postretirement Medical Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan		$ (7.0)		$ (4.0)		$ (6.0)	[1]	$ (4.0)

[1] *Includes Omega activity from March 30, 2015 to

[2] **Includes Elan activity from December 18, 2013 to June 28, 2014.