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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Gross Carrying Amount (definite-lived) | $ 1,230.4 | $ 1,261.8
Accumulated Amortization | 714.1 | 696.1
Net Carrying Amount, (definite-lived) | 516.3 | 565.7
Indefinite-lived trade name intangible asset | 269.1 | 269.1
Intangible assets, gross (excluding goodwill) | 1,499.5 | 1,530.9
Net Carrying Amount, intangible assets | $ 785.4 | 834.8
Customer relationships |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Gross Carrying Amount (definite-lived) | $ 780.2 | 782.6
Accumulated Amortization | 462.5 | 450.6
Net Carrying Amount, (definite-lived) | $ 317.7 | 332.0
Proprietary technology |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 13 years |
Gross Carrying Amount (definite-lived) | $ 350.8 | 365.1
Accumulated Amortization | 152.2 | 146.1
Net Carrying Amount, (definite-lived) | $ 198.6 | 219.0
Backlog and other |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 1 year |
Gross Carrying Amount (definite-lived) | $ 99.4 | 114.1
Accumulated Amortization | 99.4 | 99.4
Net Carrying Amount, (definite-lived) | $ 0.0 | $ 14.7

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