Additional Financial Information (Narrative) (Details) - $ / shares	3 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Class A Common Stock
Dividends Payable [Line Items]
Dividend declared per share	$ 0.23	$ 0
Class B Common Stock
Dividends Payable [Line Items]
Dividend declared per share	0.23	$ 0
Semi Annual Dividend \| Class A Common Stock
Dividends Payable [Line Items]
Dividend declared per share	$ 0.23
Dividend payable date	2019-10
Dividend record date	Sep. 04, 2019
Semi Annual Dividend \| Class B Common Stock
Dividends Payable [Line Items]
Dividend declared per share	$ 0.23
Dividend payable date	2019-10
Dividend record date	Sep. 04, 2019

Aggregate dividends declared during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Date the declared dividend will be paid, in CCYY-MM format.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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