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Note 7 - Fair Value Measurements (Tables) | 12 Months Ended
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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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