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Consolidated Balance Sheet (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Deferred income tax credit carryforwards $ 669.4 $ 772.7
Common stock - issued shares 215.9 211.9
Common stock - outstanding shares 215.9 211.9