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Stockholders' Equity - Summary of Stockholders' Equity Capital Accounts (Details) - shares
Mar. 31, 2021
Dec. 31, 2020
Preferred Stock:    
Authorized shares 50,000,000 50,000,000
Issued shares 0 0
Outstanding shares 0 0
Common Stock, $1.00 par value:    
Authorized shares 700,000,000 700,000,000
Issued shares 419,306,453 419,124,469
Outstanding shares 417,520,420 417,400,602