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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Accounts and accrued income receivable, allowances $ 21.5 $ 21.8
Pledged securities included in debt securities 92.4 107.0
Debt securities, amortized cost $ 7,730.9 $ 7,895.2
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 103.0 103.1