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Note 7 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

				2020								2019
		Fair Value		Carrying				Estimated				Carrying				Estimated
		Hierarchy		Value				Fair Value				Value				Fair Value
Financial instrument not carried at fair value:
Senior Notes (Note 15)		Level 2		$	3,140.8			$	3,652.2			$	2,650.4			$	2,902.2

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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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