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Share-Based Compensation Plans - Class A common stock options (Details)	Dec. 31, 2018 item
Common stock option plan
Share-Based Compensation Plans
Pre-announcements	60

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- Definition

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

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No definition available.

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- Definition

Number of pre-announcements in which the size of the restricted stock grant is defined in financial terms and is subsequently converted into shares.

+ References

No definition available.

+ Details

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