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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, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of actuarial losses of defined benefit pension plans [1] $ (3.6) $ (3.1)
Recognition of actuarial losses associated with pension settlement [1] 0.0 (6.1)
Interest income (expense) on interest rate swap [1] 0.6 (0.3)
Total before tax [1] (3.0) (9.5)
Income tax benefit [1] 0.8 3.5
Total reclassifications for the period, net of tax [1] $ (2.2) $ (6.0)
[1] Amount in parentheses indicate debits to profit/loss.