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Other-Net, (Income) Expense
12 Months Ended
Dec. 31, 2023
Nonoperating Income (Expense) [Abstract]  
Other-Net, (Income) Expense Other–Net, (Income) Expense
Other–net, (income) expense consisted of the following:
202320222021
Interest expense$485.9 $331.6 $339.8 
Interest income(173.6)(62.8)(25.4)
Net investment (gains) losses on equity securities (Note 7)20.2 410.7 (176.9)
Debt extinguishment loss (Note 11) — 405.2 
Retirement benefit plans(461.9)(372.9)(289.7)
Other (income) expense32.7 14.3 (51.4)
Other–net, (income) expense$(96.7)$320.9 $201.6