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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments Debt And Equity Securities [Abstract] |
Schedule of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Cost or | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | amortized | ​ | Unrealized
​ | ​ | Market value | ​ | cost | ​ | loss, net
​ | ​ | (In millions)
December 31, 2021: |  | ​ |  |  | ​ |  |  | ​ |
Current assets | ​ | $ | 2.6 | ​ | $ | 2.6 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets | ​ | $ | 3.3 | ​ | $ | 3.3 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022: | ​ |  |  | ​ |  |  | ​ |  |
Current assets | ​ | $ | 75.1 | ​ | $ | 75.7 | ​ | $ | (.6)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets | ​ | $ | 1.2 | ​ | $ | 1.2 | ​ | $ | —
​
Schedule of Marketable Securities and Fair Value Measurements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ | ​ | ​ | ​ | ​ | Quoted | ​ | Significant
​ | ​ | ​ | ​ | ​ | Prices in | ​ | Other
​ | ​ | ​ | ​ | ​ | Active | ​ | Observable
​ | ​ | ​ | ​ | ​ | Markets | ​ | Inputs
​ |  | Total |  | (Level 1) |  | (Level 2)
​ | ​ | (In millions)
December 31, 2021: |  | ​ |  |  | ​ |  |  | ​ |
Current assets - fixed income securities | ​ | $ | 2.6 | ​ | $ | — | ​ | $ | 2.6
Noncurrent assets: | ​ |  |  | ​ |  |  | ​ |  |
Fixed income securities | ​ | $ | 1.3 | ​ | $ | — | ​ | $ | 1.3
Mutual funds | ​ |  | 2.0 | ​ |  | 2.0 | ​ |  | —
Total | ​ | $ | 3.3 | ​ | $ | 2.0 | ​ | $ | 1.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2022: | ​ |  |  | ​ |  |  | ​ |  |
Current assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed income securities | ​ | $ | 73.3 | ​ | $ | — | ​ | $ | 73.3
Mutual funds | ​ | ​ | 1.8 | ​ | ​ | 1.8 | ​ |  | —
Total | ​ | $ | 75.1 | ​ | $ | 1.8 | ​ | $ | 73.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets - fixed income securities | ​ | $ | 1.2 | ​ | $ | — | ​ | $ | 1.2
​

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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