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Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (expense), net | $ 3.6 | $ 23.3 | $ 217.2 | $ 66.2
Total before tax | 28.5 | 39.2 | 207.2 | 88.6
Income tax | 20.4 | 0.7 | 55.7 | 25.1
Reclassification out of Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total before tax | 19.6 | 40.3 | 237.6 | 120.8
Income tax | (0.4) | (1.4) | (1.2) | (4.6)
Total reclassifications for the period | 19.2 | 38.9 | 236.4 | 116.2
Reclassification out of Accumulated Other Comprehensive Loss | Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (expense), net | 0.5 | 1.9 | (2.9) | 4.8
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (expense), net | (1.4) | (1.6) | (4.0) | (4.5)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (expense), net | 20.5 | 40.0 | 61.3 | 120.5
Reclassification out of Accumulated Other Comprehensive Loss | Settlement losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other (expense), net | $ 0.0 | $ 0.0 | $ 183.2 | $ 0.0

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