Note 10 - Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other Noncurrent Assets [Member]
Right-of-use assets	$ 350.2	$ 309.9
Other Current Liabilities [Member]
Lease liabilities, current	(99.9)	(86.0)
Other Noncurrent Liabilities [Member]
Lease liabilities, long-term	$ (252.9)	$ (223.5)