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Other - Net, (Income) Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Nonoperating Income (Expense) [Abstract] |  |  |
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) | 0.0 | 0.0 | 405.2
Retirement benefit plans | (461.9) | (372.9) | (289.7)
Other (income) expense | 32.7 | 14.3 | (51.4)
Other–net, (income) expense | $ (96.7) | $ 320.9 | $ 201.6

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