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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Millions	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Allowance and other receivables, net of allowance | $	$ 0.8	$ 0.5
Common stock, shares authorized (in shares)	761,875,318,444	761,875,338,444
Common stock, shares issued (in shares)	761,864,262,444	761,864,338,444
Ordinary shares
Common stock, par value (in GBP per share) | (per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	28,944,000	29,000,000
Common stock, shares outstanding (in shares)	28,944,000	29,000,000
Deferred shares
Common stock, shares authorized (in shares)	761,835,318,444	761,835,338,444
Common stock, shares issued (in shares)	761,835,318,444	761,835,338,444
Common stock, shares outstanding (in shares)	761,835,318,444	761,835,338,444

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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