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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts and accrued income receivable, allowances | $ 21.8 | $ 21.3
Pledged securities included in debt securities | 107.0 | 86.0
Debt securities, amortized cost | $ 7,895.2 | $ 9,169.6
Preferred stock, par value | $ 0.00001 | $ 0.00001
Preferred stock, shares authorized | 0.5 | 0.5
Preferred stock, outstanding | 0.0 | 0.0
Common stock, par value | $ 0.00001 | $ 0.00001
Common stock, shares authorized | 300.0 | 300.0
Common stock, shares outstanding | 103.1 | 103.2

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