Note 10 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Lease, Weighted Average Remaining Lease Term	5 years	5 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.73%	2.27%
Operating Lease, Payments	$ 106.2	$ 87.6	$ 59.5
Operating Lease, Expense	106.8	87.7	58.6
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	159.7	213.9	$ 101.9
Mass Movement, Inc. [Member]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 9.1	$ 28.6