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Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Statement of Financial Position [Abstract] |  |
Deferred income tax credit carryforwards | $ 723.1 | $ 772.7
Common stock - issued shares | 214.2 | 211.9
Common stock - outstanding shares | 214.2 | 211.9

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