Financial Instruments - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Liabilities
Deferred finance charges	$ 10.1	$ 11.4
Deferred finance charges, current	2.5	2.5
Carrying Value
Assets
Cash and cash equivalents	34.8	32.4
Liabilities
Current portion of long-term debt	26.6	26.1
Long-term debt	661.0	674.5
Level 1 \| Fair Value
Assets
Cash and cash equivalents	34.8	32.4
Level 2 \| Fair Value
Liabilities
Current portion of long-term debt	26.6	26.1
Long-term debt	$ 703.7	$ 716.3

Long-Term Debt, Gross, Current Maturities, Fair Value Disclosure

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- Definition

Long-Term Debt, Gross, Excluding Current Maturities, Fair Value Disclosure

+ References

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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-Topic 835
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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