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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Intangible Assets |  |
Useful lives | 11 years |
Gross Carrying Amount (definite-lived) | $ 1,802.4 | $ 1,261.8
Accumulated Amortization | 824.5 | 696.1
Net Carrying Amount, (definite-lived) | 977.9 | 565.7
Indefinite-lived trade name intangible asset | 269.1 | 269.1
Intangible assets, gross (excluding goodwill) | 2,071.5 | 1,530.9
Net Carrying Amount, intangible assets | $ 1,247.0 | 834.8
Customer relationships |  |
Intangible Assets |  |
Useful lives | 12 years |
Gross Carrying Amount (definite-lived) | $ 1,296.7 | 782.6
Accumulated Amortization | 505.2 | 450.6
Net Carrying Amount, (definite-lived) | $ 791.5 | 332.0
Proprietary technology |  |
Intangible Assets |  |
Useful lives | 13 years |
Gross Carrying Amount (definite-lived) | $ 351.2 | 365.1
Accumulated Amortization | 164.8 | 146.1
Net Carrying Amount, (definite-lived) | $ 186.4 | 219.0
Backlog and other |  |
Intangible Assets |  |
Useful lives | 1 year |
Gross Carrying Amount (definite-lived) | $ 154.5 | 114.1
Accumulated Amortization | 154.5 | 99.4
Net Carrying Amount, (definite-lived) | $ 0.0 | $ 14.7

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