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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Components of Changes in Accumulated Other Comprehensive Income (AOCI) | Changes in accumulated other comprehensive income (loss) (AOCI) by component were as follows (dollars in millions). Amounts in parentheses indicate losses:
|  | Foreign Currency Translation Adjustments |  |  | Unrealized Loss On Treasury Locks, Net |  |  | Unrealized Loss on Foreign Exchange Contracts |  |  | Unfunded Employee Benefit Obligations |  |  | Total |
Balance at January 1, 2018 |  | $ | (0.3 | ) |  | $ | (14.2 | ) |  | $ | (0.3 | ) |  | $ | (142.1 | ) |  | $ | (156.9 | )
Amounts reclassified from AOCI, net of tax |  |  | (0.1 | ) |  |  | 2.0 |  |  |  | — |  |  |  | 6.0 |  |  |  | 7.9 |
Balance at June 30, 2018 |  | $ | (0.4 | ) |  | $ | (12.2 | ) |  | $ | (0.3 | ) |  | $ | (136.1 | ) |  | $ | (149.0 | )
Reclassifications Out of Accumulated Other Comprehensive Income (AOCI) | Reclassifications out of AOCI were as follows (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income:
|  |  |  | Amounts Reclassified from AOCI |  |  |
|  |  |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |  |  |
Details about AOCI Components |  |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  |
Unrealized loss on treasury locks, net (a) |  |  |  | $ | (1.3 | ) |  | $ | (1.4 | ) |  | $ | (2.7 | ) |  | $ | (2.8 | ) |  | See (a) below
|  |  |  |  | 0.3 |  |  |  | 0.6 |  |  |  | 0.7 |  |  |  | 1.2 |  |  | Tax benefit
|  |  |  | $ | (1.0 | ) |  | $ | (0.8 | ) |  | $ | (2.0 | ) |  | $ | (1.6 | ) |  | Net of tax
Unfunded employee benefit obligations (b) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service costs |  |  |  | $ | (1.7 | ) |  | $ | (1.4 | ) |  | $ | (3.3 | ) |  | $ | (2.9 | ) |  | See (b) below
Amortization of actuarial gains / (losses) |  |  |  |  | (2.3 | ) |  |  | (1.9 | ) |  |  | (4.6 | ) |  |  | (3.7 | ) |  | See (b) below
|  |  |  |  | (4.0 | ) |  |  | (3.3 | ) |  |  | (7.9 | ) |  |  | (6.6 | ) |  | Total before tax
|  |  |  |  | 1.0 |  |  |  | 1.2 |  |  |  | 1.9 |  |  |  | 2.3 |  |  | Tax benefit
|  |  |  | $ | (3.0 | ) |  | $ | (2.1 | ) |  | $ | (6.0 | ) |  | $ | (4.3 | ) |  | Net of tax
(a) | This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.2 million ($3.9 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 13, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2017 Annual Report on Form 10-K.
(b) | These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 13, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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