Post Employment Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions		6 Months Ended				12 Months Ended
		Dec. 31, 2015		Jun. 28, 2014		Jun. 27, 2015		Jun. 28, 2014		Dec. 18, 2013	[2]	Jun. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost		$ 1.7				$ 2.4	[1]	$ 1.4	[2]
Fair value of pension 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]
Unfunded accumulated projected benefit obligation		109.4		89.0		136.6		89.0
Defined Benefit Plan, Actual Return on Plan Assets		(0.6)				(1.0)	[1]
Actuarial loss		(10.1)				(6.8)	[1]
Defined Benefit Plan, Benefits Paid		(0.6)				(0.1)	[1]
Defined Benefit Plan, Purchases, Sales, and Settlements		0.0				0.0	[1]
Defined Benefit Plan, Contributions by Employer		(3.3)				(2.4)	[1]
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		3.7				17.5	[1]	0.8	[2]
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, Benefit Obligation		135.0		89.0	[1]	140.3		89.0	[1]
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		5.6				70.4	[1]
Defined Benefit Plan, Service Cost		2.2				0.9	[1]	0.0	[2]
Ireland
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	[2]							1.4
Fair value of pension 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, Actual Return on Plan Assets	[2]							5.4
Actuarial loss	[2]							(12.1)
Defined Benefit Plan, Benefits Paid	[2]							(0.2)
Defined Benefit Plan, Purchases, Sales, and Settlements	[2]							(12.1)
Defined Benefit Plan, Contributions by Employer	[2]							0.0
Defined Benefit Plan, Settlements, Benefit Obligation	[2]							(8.0)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[2]			0.7
Defined Benefit Plan, Benefit Obligation				89.0	[2]	140.3	[1]	89.0	[2]			$ 0.0	[2]
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[2]							84.4
Defined Benefit Plan, Service Cost	[2]							0.0
Ireland | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				98.8		101.4		98.8
Ireland | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.8		31.9		0.8
Ireland | Equities [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Equities [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				48.3		49.7		48.3
Ireland | Bonds [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Bonds [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Property [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets						0.0
Ireland | Property [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Insurance Contract, Rights and Obligations [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets						0.0
Ireland | Insurance Contract, Rights and Obligations [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets						0.0
Ireland | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.1		0.2		0.1
Ireland | Cash and Cash Equivalents [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.1		0.2		0.1
Ireland | Cash and Cash Equivalents [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Cash and Cash Equivalents [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0		0.0		0.0
Ireland | Absolute return fund [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0				0.0
Assets [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		45.7		0.8	[1],[2]	31.9	[1]	0.8	[1],[2]	$ 0.0
Assets [Member] | Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		15.9		20.8		16.7		20.8
Assets [Member] | Equities [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		15.9		20.8		16.7		20.8
Assets [Member] | Bonds [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		39.6		48.3		49.7		48.3
Assets [Member] | Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8		0.8		0.4		0.8
Assets [Member] | Property [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0				0.0
Assets [Member] | Property [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8		0.8		0.4		0.8
Assets [Member] | Insurance Contract, Rights and Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		44.9				31.5
Assets [Member] | Insurance Contract, Rights and Obligations [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		44.9				31.5
Assets [Member] | Absolute return fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		33.7		29.6		34.8		29.6
Assets [Member] | Absolute return fund [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				29.6				29.6
Assets [Member] | Absolute return fund [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0		0.0		0.0		0.0
Assets [Member] | Ireland
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		134.9
Assets [Member] | Ireland | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		89.2
Assets [Member] | Ireland | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		45.7
Assets [Member] | Ireland | Equities [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Equities [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		39.6
Assets [Member] | Ireland | Bonds [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Bonds [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Property [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Property [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Insurance Contract, Rights and Obligations [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Insurance Contract, Rights and Obligations [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0
Assets [Member] | Ireland | Absolute return fund [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		33.7				34.8
Assets [Member] | Ireland | Absolute return fund [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
Postretirement Medical Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost		0.1				0.2	[1]	0.3
Fair value of pension 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, Actual Return on Plan Assets		0.0						0.0	[1]
Actuarial loss		(0.5)						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]
Defined Benefit Plan, Contributions by Employer		0.0						0.0	[1]
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		0.0						0.0	[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, Benefit Obligation		7.0		$ 4.6	[1]	6.0	[1]	4.6	[1]			$ 3.9
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		0.0				1.0	[1]	0.0
Defined Benefit Plan, Service Cost		$ 0.3				$ 0.3	[1]	$ 0.5

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

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