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Summary of Significant Accounting Policies - Dividends Paid (Details) - $ / shares				3 Months Ended				9 Months Ended
	Dec. 15, 2020	Dec. 01, 2020	Oct. 27, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Subsequent Event
Class of Stock [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.318
Dividends payable, date to be paid	Dec. 15, 2020
Dividends payable, date of record		Dec. 01, 2020
Common Class A
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share)				$ 0.3125	$ 0.2100	$ 0.2100	$ 0.20	$ 0.7325	$ 0.60
Common Class C
Class of Stock [Line Items]
Common stock, dividends, per share, cash paid (in dollars per share)				$ 0.3125	$ 0.2100	$ 0.2100	$ 0.20	$ 0.7325	$ 0.60

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