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Note 4 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

			2021								2020
	Fair Value		Carrying				Estimated				Carrying				Estimated
	Hierarchy		Value				Fair Value				Value				Fair Value
Financial instruments not carried at fair value:
Senior notes (Note 10)	Level 2		$	2,691.6			$	3,028.4			$	3,140.8			$	3,652.2

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Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

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