Note 12 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Cost	$ 975.2	$ 927.1
Accumulated amortization	(503.5)	(422.3)
Net	$ 471.7	$ 504.8
Technology-Based Intangible Assets [Member]
Weighted average useful life (Year)	8 years	8 years
Cost	$ 370.2	$ 355.1
Accumulated amortization	(261.2)	(229.3)
Net	$ 109.0	$ 125.8
Marketing-Related Intangible Assets [Member]
Weighted average useful life (Year)	6 years	6 years
Cost	$ 42.7	$ 41.3
Accumulated amortization	(38.7)	(35.5)
Net	$ 4.0	$ 5.8
Contract-Based Intangible Assets [Member]
Weighted average useful life (Year)	6 years	6 years
Cost	$ 5.0	$ 5.0
Accumulated amortization	(5.0)	(5.0)
Net	$ 0.0	$ 0.0
Customer-Related Intangible Assets [Member]
Weighted average useful life (Year)	13 years	13 years
Cost	$ 542.1	$ 510.7
Accumulated amortization	(190.7)	(146.7)
Net	$ 351.4	$ 364.0
Database [Member]
Weighted average useful life (Year)	8 years	8 years
Cost	$ 15.2	$ 15.0
Accumulated amortization	(7.9)	(5.8)
Net	$ 7.3	$ 9.2