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Marketable Securities and Fair Value Measurements - Narrative (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2015
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Carryover basis		$ 0
Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Number of shares held in an affiliated entity (shares)	1,644,155
Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Common stock
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Investment owned (shares)	395,758

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Marketable securities and fair value measurements.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Balance held at close of period in number of shares.

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Number of shares of affiliates held for management investment companies.

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