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Stockholders' Equity (Dividends Declared and Paid) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 33 Months Ended
Jan. 20, 2022
Mar. 31, 2021
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Subsequent Event [Line Items]                
Cash dividends declared and paid per common share (in dollars per share)   $ 0.16 $ 0.15 $ 0.20 $ 4.74 $ 0.63 $ 0.63 $ 0.16
Common Stock, Dividends, Per Share, Declared   $ 0.16 $ 0.15 $ 0.20       $ 0.16
Special Dividends                
Subsequent Event [Line Items]                
Cash dividends declared and paid per common share (in dollars per share)         4.00      
Common Stock, Dividends, Per Share, Declared         $ 4.00      
Payments of Dividends         $ 301.5      
Subsequent event                
Subsequent Event [Line Items]                
Common Stock, Dividends, Per Share, Declared $ 0.20