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Fair Value measurements - Schedule of Carrying Values and Associated Fair Values of Financial Assets and Liabilities (Details) - 5.75% Senior Notes Due 2028 - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	$ 300.4	$ 295.0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	$ 300.0	$ 300.0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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