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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, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of actuarial losses of defined benefit pension plans [1],[2] $ (3.1) $ (6.2)
Recognition of actuarial losses associated with pension settlement [1] (6.1) 0.0
Interest expense on interest rate swap [1] (0.3) 0.0
Total before tax [1] (9.5) (6.2)
Income tax benefit [1] 3.5 2.2
Total reclassifications for the period, net of tax [1] $ (6.0) $ (4.0)
[1] Amount in parenthesis indicate debits to profit/loss.
[2] The actuarial loss components of Accumulated other comprehensive loss are included in the computation of net periodic pension cost for the period, as disclosed in Note 9 – Pensions.