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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Cost | $ 972.4 | $ 927.1
Accumulated amortization | (464.4) | (422.3)
Net | $ 508.0 | $ 504.8
Technology-Based Intangible Assets [Member] |  |
Weighted average useful life (Year) | 8 years | 8 years
Cost | $ 369.3 | $ 355.1
Accumulated amortization | (245.8) | (229.3)
Net | $ 123.5 | $ 125.8
Marketing-Related Intangible Assets [Member] |  |
Weighted average useful life (Year) | 6 years | 6 years
Cost | $ 42.6 | $ 41.3
Accumulated amortization | (37.4) | (35.5)
Net | $ 5.2 | $ 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 | $ 540.3 | $ 510.7
Accumulated amortization | (169.3) | (146.7)
Net | $ 371.0 | $ 364.0
Database [Member] |  |
Weighted average useful life (Year) | 8 years | 8 years
Cost | $ 15.2 | $ 15.0
Accumulated amortization | (6.9) | (5.8)
Net | $ 8.3 | $ 9.2

X
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