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Short-Term Borrowings - Short-term borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Short-Term Borrowings.    
Weighted average interest rates of short-term borrowings 4.76% 2.16%
Short-term borrowings average $ 225.1 $ 181.1
Maximum amounts outstanding of short-term borrowing $ 410.6 $ 317.7