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Condensed Balance Sheets Parenthetical - USD ($)
shares in Millions, $ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Assets      
Accumulated depreciation $ 5,009.8 $ 4,826.4 $ 4,636.9
Shareholders' equity:      
Common stock, par value $ 1.00 $ 1.00 $ 1.00
Common stock, authorized (in shares) 240.0 240.0 240.0
Common stock, issued 117.5 120.2 125.8
Common stock, outstanding 117.5 120.2 125.8