Equity (Reconciliation of Ordinary Shares) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020
Stock Repurchased During Period, Value			$ 0
Ordinary shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)	265.9	266.4	262.8
Shares issued under incentive plans, net			1.7
Repurchase of ordinary shares (shares)	(2.1)	(2.4)
Ending balance (shares)	264.1	265.5	264.5
Ordinary shares held in treasury, at cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)			24.5
Shares issued under incentive plans, net			0.0
Ending balance (shares)			24.5

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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