Post Employment Plans - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Jun. 28, 2014		Jun. 27, 2015		Jun. 28, 2014		Sep. 27, 2014	Dec. 18, 2013	[2]	Jun. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost				$ 2.4	[1]	$ 1.4	[2]
Fair value of pension plan assets	[1]	$ 99.6		133.3		99.6
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	[1]			49.9
Defined Benefit Plan, Funded Status of Plan	[1]			(7.0)
Defined Benefit Plan, Actual Return on Plan Assets	[1]			(1.0)
Actuarial loss	[1]			(6.8)
Defined Benefit Plan, Benefits Paid	[1]			(0.1)
Defined Contribution Plan, Employer Discretionary Contribution Amount	[1]			0.9
Defined Benefit Plan, Purchases, Sales, and Settlements	[1]			0.0
Defined Benefit Plan, Contributions by Employer	[1]			2.4
Defined Benefit Plan, Settlements, Benefit Obligation	[1]			0.0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[1]			14.7
Defined Benefit Plan, Benefit Obligation	[1]	89.0		140.3		89.0
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[1]			70.4
Defined Benefit Plan, Service Cost				0.9	[1]	0.0	[2]
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8	[2]	31.9	[1]	0.8	[2]		$ 0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets				31.5	[1]	0.7	[2]
IRELAND
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	[2]	1.4
Fair value of pension plan assets		99.6		99.6	[2]	99.6			$ 0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	[2]					107.3
Defined Benefit Plan, Funded Status of Plan	[2]			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 Contribution Plan, Employer Discretionary Contribution Amount	[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		(0.8)
Defined Benefit Plan, Benefit Obligation	[2]	89.0				89.0					$ 0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	[2]	84.4
Defined Benefit Plan, Service Cost	[2]	0.0
IRELAND | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		98.8				98.8
IRELAND | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8				0.8
IRELAND | Equities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets								$ 0.0
IRELAND | Equities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets								0.0
IRELAND | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		48.3				48.3
IRELAND | Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Bonds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8				0.8
IRELAND | Property [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Property [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Property [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8				0.8
IRELAND | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.1				0.1
IRELAND | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.1				0.1
IRELAND | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Cash and Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Absolute return fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		29.6				29.6
IRELAND | Absolute return fund [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		29.6				29.6
IRELAND | Absolute return fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
IRELAND | Absolute return fund [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.0				0.0
Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				133.3
Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				101.4
Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		0.8	[1]	31.9		0.8	[1]
Assets [Member] | Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				16.7				$ 20.8
Assets [Member] | Equities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		20.8		16.7		20.8
Assets [Member] | Equities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Equities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				49.7
Assets [Member] | Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets		48.3		49.7		48.3
Assets [Member] | Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Bonds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.4
Assets [Member] | Property [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Property [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Property [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.4
Assets [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.2
Assets [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.2
Assets [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Absolute return fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				34.8
Assets [Member] | Absolute return fund [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				34.8
Assets [Member] | Absolute return fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Absolute return fund [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Insurance Contract, Rights and Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				31.5
Assets [Member] | Insurance Contract, Rights and Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Insurance Contract, Rights and Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				0.0
Assets [Member] | Insurance Contract, Rights and Obligations [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets				31.5
Postretirement Medical Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost				0.2	[1]	0.3
Fair value of pension plan assets				0.0	[1]						0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets				0.0	[1]	0.0
Defined Benefit Plan, Funded Status of Plan		(4.6)		(6.0)	[1]	(4.6)
Defined Benefit Plan, Actual Return on Plan Assets				0.0	[1]	0.0
Actuarial loss				0.0	[1]	0.0
Defined Benefit Plan, Benefits Paid				0.0	[1]	0.0
Defined Contribution Plan, Employer Discretionary Contribution Amount				0.1	[1]	0.1
Defined Benefit Plan, Purchases, Sales, and Settlements				0.0	[1]	0.0
Defined Benefit Plan, Contributions by Employer				0.0	[1]	0.0
Defined Benefit Plan, Settlements, Benefit Obligation				0.0	[1]	0.0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)				0.0	[1]	0.0
Defined Benefit Plan, Benefit Obligation		$ 4.6	[1]	6.0	[1]	4.6	[1]				$ 3.9
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation				1.0	[1]	0.0
Defined Benefit Plan, Service Cost				0.3	[1]	$ 0.5
Defined Contribution Plan Type [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	[1]			$ (17.5)

[1] *Includes Omega activity from March 30, 2015 to June 27, 2015

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