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Stockholders' Equity - Reclassifications from Accumulated Other Comprehensive Loss (Details) - Amount Reclassified from Accumulated Other Comprehensive Loss - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of actuarial losses of defined benefit pension plans | $ (0.8) | $ (0.6) | $ (2.2) | $ (1.7)
Amortization of prior service costs of defined benefit pension plans | 0.0 | (0.1) | (0.1) | (0.1)
Interest rate swaps | 0.6 | 0.9 | 2.4 | 2.3
Total before tax | (0.2) | 0.2 | 0.1 | 0.5
Income tax expense | 0.0 | (0.1) | 0.0 | (0.2)
Total reclassifications for the period, net of tax | $ (0.2) | $ 0.1 | $ 0.1 | $ 0.3

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