Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - 9 months ended Sep. 29, 2017 - 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. 30, 2016	118,182,944	118,200,000
Beginning balance, treasury shares (in shares) at Dec. 30, 2016	13,515,399		13,500,000
Beginning balance at Dec. 30, 2016	$ 4,984.3	$ 23.6	$ (919.8)	$ 5,424.0	$ 529.0	$ (72.5)
Impact of accounting standard adoptions	(72.1)				(72.1)
Net income	525.7				525.7
Currency translation adjustments	13.0					13.0
Change in derivatives, net of tax	0.9					0.9
Unrecognized gain on benefit plans	45.4					45.4
Unrecognized gain on investments	0.1					0.1
Share options exercised (in shares)		100,000
Share options exercised (in usd)	4.0	$ 0.0		4.0
Vesting of restricted shares (in shares)		400,000
Vesting of restricted shares (in usd)	(4.6)	$ 0.1	(4.7)	0.0
Share-based compensation	46.1			46.1
Reissuance of treasury shares	3.2		$ 5.2		(2.0)
Repurchase of shares (in shares)			9,500,000
Repurchase of shares (in usd)	$ 433.0		$ (433.0)
Ending balance, ordinary shares (in shares) at Sep. 29, 2017	118,666,830	118,700,000
Ending balance, treasury shares (in shares) at Sep. 29, 2017	23,004,384		23,000,000
Ending balance at Sep. 29, 2017	$ 5,113.0	$ 23.7	$ (1,352.3)	$ 5,474.1	$ 980.6	$ (13.1)