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Consolidated Balance Sheet (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Deferred income tax credit carryforwards $ 821.3 $ 867.4
Common stock - issued shares 218.5 216.7
Common stock - outstanding shares 218.5 216.7