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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
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of actuarial losses of defined benefit pension plans | [1],[2] | $ (1.0) | $ (0.8)
Total before tax | [1] | (1.0) | (0.8)
Income tax benefit | [1],[2] | 0.2 | 0.3
Total reclassifications for the period, net of tax | [1] | $ (0.8) | $ (0.5)
[1] | Amounts in parentheses indicate losses.
[2] | Continuing operations only.

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