Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - 6 months ended Jun. 30, 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	462.0				462.0
Currency translation adjustments	7.4					7.4
Change in derivatives, net of tax	0.6					0.6
Unrecognized gain on benefit plans	45.9					45.9
Unrecognized gain on investments	10.6					10.6
Share options exercised (in shares)		100,000
Share options exercised (in usd)	3.9	$ 0.0		3.9
Vesting of restricted shares (in shares)		300,000
Vesting of restricted shares (in usd)	(4.4)	$ 0.1	(4.5)	0.0
Share-based compensation	31.8			31.8
Reissuance of treasury shares	2.3		$ 3.7		(1.4)
Repurchase of shares (in shares)			8,000,000
Repurchase of shares (in usd)	$ 376.3		$ (376.3)
Ending balance, ordinary shares (in shares) at Jun. 30, 2017	118,646,325	118,600,000
Ending balance, treasury shares (in shares) at Jun. 30, 2017	21,507,776		21,500,000
Ending balance at Jun. 30, 2017	$ 5,096.0	$ 23.7	$ (1,296.9)	$ 5,459.7	$ 917.5	$ (8.0)