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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |
Fiduciary cash | $ 5,481.3 | $ 5,571.8
Deferred income tax credit carryforwards | $ 771.8 | $ 867.4
Common stock - authorized shares | 400,000,000 | 400,000,000
Common stock - issued shares | 250,000,000 | 216,700,000
Common stock - outstanding shares | 250,000,000 | 216,700,000

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