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Shareholders' Equity (Details) - Class A ordinary shares, U.S. - shares shares in Millions	Oct. 05, 2017	May 22, 2017
Class of Stock [Line Items]
Shares authorized under UK law (in shares)		101.1
Shares authorized, offered by way of a rights issue or similar issue under UK law (in shares)		202.2
Scenario, Forecast [Member]
Class of Stock [Line Items]
Shares authorized under UK law (in shares)	146.1
Shares authorized, offered by way of a rights issue or similar issue under UK law (in shares)	292.2

X

- Definition

Common Stock, Shares Authorized, Offered with a Rights Issue, Under UK Law

+ References

No definition available.

+ Details

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X

- Definition

Common Stock, Shares Authorized, Under UK Law

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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