Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Ordinary Shares	Treasury Shares	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Loss
Shares, Outstanding		92,200,000	5,900,000
Beginning balance at Dec. 29, 2017	$ 6,522.0	$ 18.4	$ (1,564.7)	$ 5,492.6	$ 2,588.6	$ (12.9)
Impact of accounting standard adoptions, net of tax	1.1				2.6	(1.5)
Net income	(18.0)				(18.0)
Currency translation adjustments	(2.3)					(2.3)
Change in derivatives, net of tax	0.4					0.4
Change in benefit plans, net of tax	(0.5)					0.5
Vesting of restricted shares (in shares)		300,000	0
Vesting of restricted shares (in usd)	(1.3)	$ 0.1	$ (1.4)	0.0
Share-based compensation	4.6			4.6
Reissuance of treasury shares (in shares)			0
Reissuance of treasury shares	0.5		$ 0.8		(0.3)
Repurchase of shares (in shares)			2,900,000
Repurchase of shares (in usd)	(45.2)		$ 45.2
Ending balance at Mar. 30, 2018	6,461.3	18.5	(1,610.5)	5,497.2	2,572.9	(16.8)
Beginning balance at Dec. 29, 2017	6,522.0	18.4	(1,564.7)	5,492.6	2,588.6	(12.9)
Net income	111.4				111.4
Currency translation adjustments	(4.1)
Change in derivatives, net of tax	0.7
Change in benefit plans, net of tax	0.9
Ending balance at Sep. 28, 2018	6,603.6	$ 18.5	$ (1,618.5)	5,521.3	2,701.0	(18.7)
Shares, Outstanding		92,500,000	8,800,000
Beginning balance at Mar. 30, 2018	6,461.3	$ 18.5	$ (1,610.5)	5,497.2	2,572.9	(16.8)
Net income	15.6				15.6
Currency translation adjustments	(5.0)					(5.0)
Change in derivatives, net of tax	0.1					0.1
Vesting of restricted shares (in shares)		0	100,000
Vesting of restricted shares (in usd)	(0.3)	$ 0.0	$ (0.2)	(0.1)
Share-based compensation	11.8			11.8
Reissuance of treasury shares (in shares)			(100,000)
Reissuance of treasury shares	0.9		$ 1.6		(0.7)
Repurchase of shares (in shares)			700,000
Repurchase of shares (in usd)	(10.0)		$ 10.0
Ending balance at Jun. 29, 2018	6,474.4	$ 18.5	$ (1,619.1)	5,508.9	2,587.8	(21.7)
Shares, Outstanding		92,500,000	9,500,000
Net income	113.8				113.8
Currency translation adjustments	3.2					3.2
Change in derivatives, net of tax	0.2					0.2
Change in benefit plans, net of tax	(0.4)					0.4
Vesting of restricted shares (in shares)		200,000	0
Vesting of restricted shares (in usd)	0.3	$ 0.0	$ (0.6)	0.9
Share-based compensation	11.5			11.5
Reissuance of treasury shares (in shares)			(100,000)
Reissuance of treasury shares	0.6		$ 1.2		(0.6)
Ending balance at Sep. 28, 2018	$ 6,603.6	$ 18.5	$ (1,618.5)	5,521.3	2,701.0	(18.7)
Shares, Outstanding		92,700,000	9,400,000
Shares, Outstanding		92,700,000	9,400,000
Beginning balance, ordinary shares (in shares) at Dec. 28, 2018	92,705,747
Beginning balance, treasury shares (in shares) at Dec. 28, 2018	9,381,870
Beginning balance at Dec. 28, 2018	$ 2,887.3	$ 18.5	$ (1,617.4)	5,528.2	(1,017.7)	(24.3)
Impact of accounting standard adoptions, net of tax	0.0				(0.5)	0.5
Net income	154.9				154.9
Currency translation adjustments	1.4					1.4
Change in derivatives, net of tax	0.2					0.2
Change in benefit plans, net of tax	(0.3)					0.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0
Stock Issued During Period, Value, Stock Options Exercised	0.3	$ 0.0		0.3
Vesting of restricted shares (in shares)		200,000	0
Vesting of restricted shares (in usd)	(0.4)	$ 0.1	$ (0.5)	0.0
Share-based compensation	10.0			10.0
Reissuance of treasury shares (in shares)			0
Reissuance of treasury shares	0.5		$ 0.9		(0.4)
Ending balance at Mar. 29, 2019	$ 3,053.9	18.6	(1,617.0)	5,538.5	(863.7)	(22.5)
Beginning balance, ordinary shares (in shares) at Dec. 28, 2018	92,705,747
Beginning balance, treasury shares (in shares) at Dec. 28, 2018	9,381,870
Beginning balance at Dec. 28, 2018	$ 2,887.3	18.5	(1,617.4)	5,528.2	(1,017.7)	(24.3)
Net income	160.6				160.6
Currency translation adjustments	1.6
Change in derivatives, net of tax	1.0
Change in benefit plans, net of tax	$ 0.9
Ending balance, ordinary shares (in shares) at Sep. 27, 2019	93,427,563
Ending balance, treasury shares (in shares) at Sep. 27, 2019	9,349,460
Ending balance at Sep. 27, 2019	$ 3,080.4	$ 18.7	$ (1,615.6)	5,559.2	(859.8)	(22.1)
Shares, Outstanding		92,900,000	9,400,000
Beginning balance at Mar. 29, 2019	3,053.9	$ 18.6	$ (1,617.0)	5,538.5	(863.7)	(22.5)
Net income	6.8				6.8
Currency translation adjustments	2.3					2.3
Change in derivatives, net of tax	0.5					0.5
Change in benefit plans, net of tax	(0.4)					0.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0
Stock Issued During Period, Value, Stock Options Exercised	0.2	$ 0.0		0.2
Vesting of restricted shares (in shares)		400,000	100,000
Vesting of restricted shares (in usd)	(1.9)	$ 0.1	$ (2.0)	0.0
Share-based compensation	12.8			12.8
Reissuance of treasury shares (in shares)			(100,000)
Reissuance of treasury shares	1.0		$ 1.6		(0.6)
Ending balance at Jun. 28, 2019	3,075.2	$ 18.7	$ (1,617.4)	5,551.5	(857.5)	(20.1)
Shares, Outstanding		93,300,000	9,400,000
Net income	(1.1)				(1.1)
Currency translation adjustments	(2.1)					(2.1)
Change in derivatives, net of tax	0.3					0.3
Change in benefit plans, net of tax	0.2					0.2
Vesting of restricted shares (in shares)		100,000	0
Vesting of restricted shares (in usd)	(0.1)	$ 0.0	$ 0.0	(0.1)
Share-based compensation	7.8			7.8
Reissuance of treasury shares (in shares)			(100,000)
Reissuance of treasury shares	$ 0.6		$ 1.8		(1.2)
Ending balance, ordinary shares (in shares) at Sep. 27, 2019	93,427,563
Ending balance, treasury shares (in shares) at Sep. 27, 2019	9,349,460
Ending balance at Sep. 27, 2019	$ 3,080.4	$ 18.7	$ (1,615.6)	$ 5,559.2	$ (859.8)	$ (22.1)
Shares, Outstanding		93,400,000	9,300,000