Note 4 - Fair Value Measurements - Long-term Debt (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Reported Value Measurement [Member]
Current portion of long-term debt and long-term debt excluding finance lease liabilities and syndicated revolving credit facility debt issuance costs	$ 3,140.4	$ 2,650.4
Estimate of Fair Value Measurement [Member]
Current portion of long-term debt and long-term debt excluding finance lease liabilities and syndicated revolving credit facility debt issuance costs	$ 3,642.2	$ 2,902.2

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

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