Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - 3 months ended Mar. 30, 2018 - USD ($) $ in Millions	Total	Ordinary Shares	Treasury Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance, ordinary shares (in shares) at Dec. 29, 2017	92,196,662	92,200,000
Beginning balance, treasury shares (in shares) at Dec. 29, 2017	5,860,430		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	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
Unrecognized gain on benefit plans	(0.5)					(0.5)
Vesting of restricted shares (in shares)		300,000
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	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, ordinary shares (in shares) at Mar. 30, 2018	92,512,847	92,500,000
Ending balance, treasury shares (in shares) at Mar. 30, 2018	8,778,722		8,800,000
Ending balance at Mar. 30, 2018	$ 6,461.3	$ 18.5	$ (1,610.5)	$ 5,497.2	$ 2,572.9	$ (16.8)