Condensed Consolidated Balance Sheets (Parenthetical) $ in Millions	Sep. 28, 2018 USD ($) $ / shares shares	Sep. 28, 2018 € / shares	Dec. 29, 2017 USD ($) $ / shares shares	Dec. 29, 2017 € / shares
Allowance for doubtful accounts \| $	$ 3.4		$ 2.8
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)	92,678,152		92,196,662
Ordinary shares, shares outstanding (in shares)	83,243,748		86,336,232
Ordinary shares held in treasury at cost (in shares)	9,434,404		5,860,430
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

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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