Note 6 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Long-Term Debt	$ 1,366.5	$ 1,326.1
Fair Value, Nonrecurring [Member] \| Senior Notes [Member]
Long-Term Debt	1,370.0	1,580.0
Long-Term Debt, Fair Value	$ 1,350.0	$ 1,570.0

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

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