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Other–Net, (Income) Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Nonoperating Income (Expense) [Abstract] |  |  |  |
Interest expense | $ 192.7 | $ 124.6 | $ 555.9 | $ 347.7
Interest income | (47.8) | (48.9) | (130.9) | (129.1)
Net investment (gains) losses on equity securities (Note 7) | (112.4) | 62.9 | 29.5 | 141.5
Retirement benefit plans | (115.4) | (115.5) | (345.9) | (346.9)
Other (income) expense | 20.9 | 0.1 | (0.1) | 11.1
Other–net, (income) expense | $ (62.0) | $ 23.2 | $ 108.5 | $ 24.3

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