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Note 6 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Long-Term Debt	$ 991.7	$ 1,261.7
Fair Value, Nonrecurring [Member] | Senior Notes [Member]
Long-Term Debt	1,240.0	1,260.0
Long-Term Debt, Fair Value	$ 1,230.0	$ 1,240.0

X

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: