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Equity Equity (Narrative) (Details) shares in Millions | Jun. 30, 2018 shares
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Class A [Member] |
Class of Stock [Line Items] |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 23.7

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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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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |