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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) $ in Millions	Sep. 29, 2019 USD ($) shares	Sep. 29, 2019 £ / shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2018 £ / shares
Statement of Financial Position [Abstract]
Accounts and other receivables, allowances | $	$ 1.8		$ 2.4
Ordinary shares
Common stock, par value (in GBP per share) | £ / shares		£ 0.50		£ 0.50
Common stock, shares authorized (in shares)	40,000,000		40,000,000
Common stock, shares issued (in shares)	29,000,000		29,000,000
Common stock, shares outstanding (in shares)	29,000,000		29,000,000
Deferred shares
Common stock, par value (in GBP per share) | £ / shares		£ 0.0001		£ 0.0001
Common stock, shares authorized (in shares)	761,845,318,444		769,423,688,000
Common stock, shares issued (in shares)	761,835,338,444		769,413,708,000
Common stock, shares outstanding (in shares)	761,835,338,444		769,413,708,000

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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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Face amount or stated value per share of common stock.

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