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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Summary of Components of Changes in Accumulated Other Comprehensive Income (AOCI) | Changes in AOCI, net of taxes, by component follows (dollars in millions). Amounts in parentheses indicate losses.
|  | Unrealized Loss on Foreign Exchange Contracts |  |  | Unrealized (Loss) Gain on Marketable Debt Securities |  |  | Unfunded Employee Benefit Obligations |  |  | Total |
Balance at January 1, 2022 |  | $ | (0.2 | ) |  | $ | (0.2 | ) |  | $ | (74.8 | ) |  | $ | (75.2 | )
Other comprehensive loss before reclassifications |  |  | — |  |  |  | (1.7 | ) |  |  | (30.2 | ) |  |  | (31.9 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | — |  |  |  | 4.7 |  |  |  | 4.7 |
Net current-period other comprehensive loss |  |  | — |  |  |  | (1.7 | ) |  |  | (25.5 | ) |  |  | (27.2 | )
Balance at December 31, 2022 |  | $ | (0.2 | ) |  | $ | (1.9 | ) |  | $ | (100.3 | ) |  | $ | (102.4 | )
Other comprehensive income before reclassifications |  |  | — |  |  |  | 1.8 |  |  |  | 23.2 |  |  |  | 25.0 |
Amounts reclassified from AOCI |  |  | 0.1 |  |  |  | — |  |  |  | 6.4 |  |  |  | 6.5 |
Net current-period other comprehensive income |  |  | 0.1 |  |  |  | 1.8 |  |  |  | 29.6 |  |  |  | 31.5 |
Balance at December 31, 2023 |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (70.7 | ) |  | $ | (70.9 | )
Summary Of Reclassifications Out of Accumulated Other Comprehensive Income (AOCI) | The following table presents information about reclassifications out of AOCI (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income.
|  | Amounts Reclassified from AOCI Year Ended December 31, |  |  |
Details about AOCI Components |  | 2023 |  |  | 2022 |  |  |
Unfunded employee benefit obligations (a) |  |  |  |  |  |  |  |
Amortization of prior service costs |  | $ | (4.8 | ) |  | $ | (3.2 | ) |  |
Amortization of actuarial gains / (losses) |  |  | (3.7 | ) |  |  | (3.0 | ) |  |
|  |  | (8.5 | ) |  |  | (6.2 | ) |  | Total before tax
|  |  | 2.1 |  |  |  | 1.5 |  |  | Tax benefit
|  | $ | (6.4 | ) |  | $ | (4.7 | ) |  | Net of tax
(a) These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, 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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