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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Par Value (in dollars per share) $ 1.00 $ 1.00
Shares Authorized (in shares) 325,000,000 325,000,000
Shares Issued (in shares) 111,000,000 111,000,000
Shares Outstanding (in shares) 111,000,000 111,000,000
4% Convertible Senior Dotes due 2024 | Convertible Senior Notes    
Stated interest rate 4.00%