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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Gross Carrying Amount (definite-lived) | $ 545.5 | $ 539.6
Intangible assets, gross (excluding goodwill) | 731.6 | 725.7
Accumulated Amortization | 297.6 | 284.1
Net Carrying Amount, (definite-lived) | 247.9 | 255.5
Indefinite-lived trade name intangible asset | 186.1 | 186.1
Net Carrying Amount, intangible assets | $ 434.0 | 441.6
Customer relationships |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Gross Carrying Amount (definite-lived) | $ 403.9 | 398.1
Accumulated Amortization | 210.9 | 199.8
Net Carrying Amount, (definite-lived) | $ 193.0 | 198.3
Proprietary technology |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 11 years |
Gross Carrying Amount (definite-lived) | $ 107.6 | 107.5
Accumulated Amortization | 53.1 | 50.7
Net Carrying Amount, (definite-lived) | $ 54.5 | 56.8
Backlog and other |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 2 years |
Gross Carrying Amount (definite-lived) | $ 34.0 | 34.0
Accumulated Amortization | 33.6 | 33.6
Net Carrying Amount, (definite-lived) | $ 0.4 | $ 0.4

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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