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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial losses of defined benefit pension plans [1] $ (0.7) $ (0.8) $ (1.5) $ (1.8)
Amortization of prior service costs of defined benefit pension plans [1] (0.1) 0.0 (0.1) 0.0
Interest rate swap [1] 0.3 0.2 0.7 0.2
Total before tax [1] (0.5) (0.6) (0.9) (1.6)
Income tax benefit [1] 0.0 0.1 0.1 0.3
Total reclassifications for the period, net of tax [1] $ (0.5) $ (0.5) $ (0.8) $ (1.3)
[1]
Amounts in parentheses indicate losses.