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Note 4 - Investments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

June 30, 2023

December 31, 2022

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

$

2,832.7

$

2,663.7

$

2,342.6

$

2,113.3

X

- Definition

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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