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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2024
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:
|  | Unrealized Loss On Foreign Exchange Contracts |  |  | Unrealized Loss on Marketable Debt Securities |  |  | Unfunded Employee Benefit Obligations |  |  | Total |
Balance at January 1, 2024 |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (70.7 | ) |  | $ | (70.9 | )
Other comprehensive loss before reclassifications, net of tax |  |  | — |  |  |  | (0.1 | ) |  |  | — |  |  |  | (0.1 | )
Amounts reclassified from AOCI, net of tax |  |  | — |  |  |  | — |  |  |  | 1.0 |  |  |  | 1.0 |
Balance at March 31, 2024 |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (69.7 | ) |  | $ | (70.0 | )
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 March 31, |  |  |
Details about AOCI Components |  | 2024 |  |  | 2023 |  |  |
Unfunded employee benefit obligations (a) |  |  |  |  |  |  |  |
Amortization of prior service costs |  | $ | (1.3 | ) |  | $ | (1.2 | ) |  | See (a) below
Amortization of actuarial losses |  |  | (0.1 | ) |  |  | (1.0 | ) |  | See (a) below
|  |  | (1.4 | ) |  |  | (2.2 | ) |  | Total before tax
|  |  | 0.4 |  |  |  | 0.6 |  |  | Tax benefit
|  | $ | (1.0 | ) |  | $ | (1.6 | ) |  | Net of tax
(a) 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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