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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

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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