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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses of defined benefit pension plans $ (0.7) $ (0.6) $ (1.4) $ (1.1)
Amortization of prior service costs of defined benefit pension plans (0.1) 0.0 (0.1) 0.0
Interest rate swaps 0.9 0.7 1.8 1.4
Total before tax 0.1 0.1 0.3 0.3
Income tax expense 0.0 0.0 0.0 (0.1)
Total reclassifications for the period, net of tax $ 0.1 $ 0.1 $ 0.3 $ 0.2