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Shareholders' Equity (Details) - Class A ordinary shares, U.S. - shares shares in Millions | Oct. 05, 2017 | May 22, 2017
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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 |

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- Definition Common Stock, Shares Authorized, Offered with a Rights Issue, Under UK Law + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Common Stock, Shares Authorized, Under UK Law + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- 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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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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