Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Trade and other receivables, allowance	$ 63.1	$ 58.4
Ordinary shares, nominal value per share (in dollars per share)	$ 0.10	$ 0.10
Ordinary shares issued (in shares)	220.5	219.5
Ordinary shares outstanding (in shares)	220.5	219.5

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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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