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Preferred and Common Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2016
Equity [Abstract]            
Preferred stock, shares authorized 5,000,000 5,000,000        
Preferred stock, par value (dollars per share) $ 0.01 $ 0.01        
Preferred stock, shares outstanding 0 0        
Common stock, shares authorized 150,000,000 150,000,000        
Common stock, par value (dollars per share) $ 0.01 $ 0.01        
Common stock, shares issued 75,400,000 80,000,000 74,700,000 73,500,000 70,600,000  
Common stock, shares outstanding 75,400,000 80,000,000 74,700,000 73,500,000 70,600,000  
Stock repurchase program, authorized amount           $ 200.0
Stock repurchase program, remaining repurchase authorization   $ 110.7        
Repurchase of Company stock $ 0.0 $ 0.0 $ 0.0 $ 50.0