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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 9 years |
Gross Carrying Amount (definite-lived) | $ 642.6 | $ 540.7
Accumulated Amortization | 369.2 | 328.9
Net Carrying Amount, (definite-lived) | 273.4 | 211.8
Indefinite-lived trade name intangible asset | 186.1 | 186.1
Intangible assets, gross (excluding goodwill) | 828.7 | 726.8
Net Carrying Amount, intangible assets | $ 459.5 | 397.9
Customer relationships |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Gross Carrying Amount (definite-lived) | $ 436.9 | 399.2
Accumulated Amortization | 252.8 | 234.7
Net Carrying Amount, (definite-lived) | $ 184.1 | 164.5
Proprietary technology |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 11 years |
Gross Carrying Amount (definite-lived) | $ 156.0 | 107.5
Accumulated Amortization | 67.0 | 60.5
Net Carrying Amount, (definite-lived) | $ 89.0 | 47.0
Backlog and other |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 2 years |
Gross Carrying Amount (definite-lived) | $ 49.7 | 34.0
Accumulated Amortization | 49.4 | 33.7
Net Carrying Amount, (definite-lived) | $ 0.3 | $ 0.3

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