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Subsequent Events - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Feb. 04, 2020
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event            
Subsequent Event [Line Items]            
Payment to acquire assets in purchase agreement   $ 5        
Common Class A            
Subsequent Event [Line Items]            
Dividends declared per share of Class A common stock (in dollars per share)     $ 0.275 $ 0.2125 $ 0.825 $ 0.6375
Common Class A | Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared per share of Class A common stock (in dollars per share) $ 0.275