Condensed Consolidated Balance Sheets (Parenthetical) $ in Millions	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2017 € / shares	Dec. 30, 2016 USD ($) $ / shares shares	Dec. 30, 2016 € / shares
Allowance for doubtful accounts | $	$ 4.0		$ 4.0
Preferred shares, par value (in usd per share) | $ / shares	$ 0.20		$ 0.20
Preferred shares, shares authorized (in shares)	500,000,000		500,000,000
Preferred shares, shares issued (in shares)	0		0
Preferred shares, shares outstanding (in shares)	0		0
Ordinary shares, par value (in usd per share) | $ / shares	$ 0.20		$ 0.20
Ordinary shares, shares authorized (in shares)	500,000,000		500,000,000
Ordinary shares, shares issued (in shares)	118,646,325		118,182,944
Ordinary shares, shares outstanding (in shares)	97,138,549		104,667,545
Ordinary shares held in treasury at cost (in shares)	21,507,776		13,515,399
Ordinary A
Ordinary shares, par value (in usd per share) | € / shares		€ 1.00		€ 1.00
Ordinary shares, shares authorized (in shares)	40,000		40,000
Ordinary shares, shares issued (in shares)	0		0
Ordinary A shares, shares outstanding (in shares)	0		0