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Consolidated Balance Sheet (Parenthetical) - $ / shares
Dec. 31, 2020
Jun. 30, 2020
Statement of Financial Position [Abstract]    
Serial preferred stock, par value (in USD per share) $ 0.50 $ 0.50
Serial preferred stock, authorized (in shares) 3,000,000 3,000,000
Serial preferred stock, issued (in shares) 0 0
Common stock, par value (in USD per share) $ 0.50 $ 0.50
Common stock, authorized (in shares) 600,000,000 600,000,000
Common stock, issued (in shares) 181,046,128 181,046,128
Treasury shares (in shares) 51,964,963 52,490,165