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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Cost | $ 1,993.8 | $ 2,355.1
Accumulated amortization | (903.3) | (1,129.2)
Net | $ 1,090.5 | $ 1,225.9
Technology-Based Intangible Assets [Member] |  |
Weighted average useful life (Year) | 7 years | 7 years
Cost | $ 527.1 | $ 576.4
Accumulated amortization | (362.4) | (403.3)
Net | $ 164.7 | $ 173.1
Marketing-Related Intangible Assets [Member] |  |
Weighted average useful life (Year) | 15 years | 15 years
Cost | $ 213.2 | $ 274.1
Accumulated amortization | (101.9) | (129.6)
Net | $ 111.3 | $ 144.5
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 | $ 879.1 | $ 1,015.4
Accumulated amortization | (297.2) | (426.5)
Net | $ 581.9 | $ 588.9
Database [Member] |  |
Weighted average useful life (Year) | 18 years | 18 years
Cost | $ 369.4 | $ 484.2
Accumulated amortization | (136.8) | (164.8)
Net | $ 232.6 | $ 319.4

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