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Non-operating Income (Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Nonoperating Income (Expense) [Abstract] |  |  |  |
Interest Expense | $ (7.4) | $ (8.0) | $ (22.6) | $ (26.6)
Amortization of Debt Issuance Costs | (0.3) | (0.4) | (0.9) | (1.2)
Interest Income, Other | 0.9 | 0.3 | 1.5 | 0.4
Interest Expense, Net | (6.9) | (8.0) | (22.0) | (27.3)
Gain (Loss) on Extinguishment of Debt | 0.0 | 0.0 | 0.0 | (0.5)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component | 0.1 | (1.4) | 0.3 | (4.3)
Total non-operating expense | $ (6.8) | $ (9.4) | $ (21.7) | $ (32.1)

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