Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 17, 2020	Jul. 31, 2020	May 31, 2020
Subsequent Event | Revolving Credit Facility | Fourth Amendment to Senior Credit Facility | Senior Credit Facility
Subsequent Event [Line Items]
Subordinated debt—affiliate		$ 187.5
Subsequent Event | Share Buyback Loans
Subsequent Event [Line Items]
Share repurchase program, amount authorized		$ 80.0
Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividends declaration per share of common stock (in dollars per share)	$ 0.18125
Class A Common Stock | Subsequent Event | Fourth Amendment to Senior Credit Facility | Senior Credit Facility
Subsequent Event [Line Items]
Shares authorized to be repurchased (in shares)		8,000,000
Class A Common Stock | Subsequent Event | Share Buyback Loans
Subsequent Event [Line Items]
Shares authorized to be repurchased (in shares)		8,000,000
Series A Preferred Stock
Subsequent Event [Line Items]
Shares authorized to be repurchased (in shares)			1,000,000
Series A Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Dividends declaration per share of preferred stock (in dollars per share)	$ 0.546875