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Financial Instruments and Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Financial Instruments and Derivative Instruments |
Schedule of fair value of financial assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurement at March 31, 2024 Using:
​ | ​ | ​ | ​ | ​ | Quoted Prices in Active | ​ | Significant Other | ​ | Significant
​ | ​ | ​ | ​ | ​ | Markets for Identical | ​ | Observable | ​ | Unobservable
​ | ​ | ​ | ​ | ​ | Assets | ​ | Inputs | ​ | Inputs
​ |  | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ | ​ | (in millions)
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Plan asset for deferred compensation(1) | ​ | $ | 2.5 | ​ | $ | 2.5 | ​ | $ | — | ​ | $ | —
Interest rate swap(2) | ​ | $ | 6.9 | ​ | $ | — | ​ | $ | 6.9 | ​ | $ | —
Designated foreign currency hedges(3) | ​ | $ | 0.1 | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | —
Total assets | ​ | $ | 9.5 | ​ | $ | 2.5 | ​ | $ | 7.0 | ​ | $ | —
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Plan liability for deferred compensation(4) | ​ | $ | 2.5 | ​ | $ | 2.5 | ​ | $ | — | ​ | $ | —
Interest rate swap(5) | ​ | $ | 0.8 | ​ | $ | — | ​ | $ | 0.8 | ​ | $ | —
Total liabilities | ​ | $ | 3.3 | ​ | $ | 2.5 | ​ | $ | 0.8 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements at December 31, 2023 Using:
​ | ​ | ​ | ​ | ​ | Quoted Prices in Active | ​ | Significant Other | ​ | Significant
​ | ​ | ​ | ​ | ​ | Markets for Identical | ​ | Observable | ​ | Unobservable
​ |  | ​ | ​ | ​ | Assets | ​ | Inputs | ​ | Inputs
​ | ​ | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ | ​ | (in millions)
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Plan asset for deferred compensation(1) | ​ | $ | 2.3 | ​ | $ | 2.3 | ​ | $ | — | ​ | $ | —
Interest rate swap(2) | ​ | $ | 6.5 | ​ | $ | — | ​ | $ | 6.5 | ​ | $ | —
Total assets | ​ | $ | 8.8 | ​ | $ | 2.3 | ​ | $ | 6.5 | ​ | $ | —
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Plan liability for deferred compensation(4) | ​ | $ | 2.3 | ​ | $ | 2.3 | ​ | $ | — | ​ | $ | —
Interest rate swap(5) | ​ | $ | 2.0 | ​ | $ | — | ​ | $ | 2.0 | ​ | $ | —
Designated foreign currency hedges(6) | ​ | $ | 0.2 | ​ | $ | — | ​ | $ | 0.2 | ​ | $ | —
Total liabilities | ​ | $ | 4.5 | ​ | $ | 2.3 | ​ | $ | 2.2 | ​ | $ | —
(1) | Included on the Company’s consolidated balance sheet in other assets (other, net).
​
(2) | As of March 31, 2024, $3.8 million classified in prepaid expenses and other current assets on the Company’s consolidated balance sheet and $3.1 million classified in other assets (other, net). As of December 31, 2023, $3.5 million classified in prepaid expenses and other current assets on the Company’s consolidated balance sheet and $3.0 million classified in other assets (other, net).
​
(3) | Included on the Company’s consolidated balance sheet in prepaid expenses and other current assets.
​ (4)Included on the Company’s consolidated balance sheet in accrued compensation and benefits. ​ (5)Included on the Company’s consolidated balance sheet in other noncurrent liabilities. ​ (6)Included on the Company’s consolidated balance sheet in accrued expenses and other liabilities. ​

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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