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Other Income (Expense), Net
 12 Months Ended
Dec. 31, 2023
Other Income and Expenses [Abstract]  
Other Income (Expense), Net Other Income (Expense), Net
Included in other income (expense), net are the following (in millions of dollars):
 202320222021
Interest income$6.7 $2.3 $0.2 
Interest expense(3.2)(2.1)(2.5)
Dividend income— — 2.7 
Foreign exchange gains (losses)(1.5)4.8 (1.0)
Other2.2 (3.4)(3.0)
Other income (expense), net$4.2 $1.6 $(3.6)

Included in interest income for 2023 is $3.0 million of interest from the Company's money market investments. The decrease in dividend income in 2022 reflects the sale of the investment in the common stock of Persol Holdings during the first quarter of 2022. Included in foreign exchange gains (losses) for 2022 is a $5.5 million foreign exchange gain on a U.S. dollar-denominated cash balance held by the Company's Japan entity (see Investment in Persol Holdings footnote). Included in Other for 2023 is a gain of $2.0 million for the receipt of final proceeds in connection with our investment in Business Talent Group, LLC that was sold in 2021. Included in Other for 2022 are transaction-related expenses for the 2022 acquisitions of RocketPower and PTS and sale of our Russia operations (see Acquisitions and Dispositions footnote) and expense related to the remeasurement of the Brazil indemnification liability (see Fair Value Measurements footnote). Included in Other for 2021 is a loss from the sale of the assets related to our minority investment in Kenzie Academy (see Fair Value Measurements footnote) and transaction-related expenses for the April 2021 acquisition of Softworld (see Acquisitions and Disposition footnote).