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Stockholders' Equity - Reclassifications from Accumulated Other Comprehensive Loss (Details) - Reclassification out of Accumulated Other Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of actuarial losses and prior service costs of defined benefit pension plans [1] $ (3.4) $ (3.6)
Interest income on interest rate swaps [1] 1.0 0.6
Total before tax [1] (2.4) (3.0)
Income tax benefit [1] 0.5 0.8
Total reclassifications for the period, net of tax [1] $ (1.9) $ (2.2)
[1]
Amount in parentheses indicate debits to profit/loss.