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Goodwill and Other Intangible Assets, Table (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Summary of the Company's amortizable intangible assets |  |
Indefinite-lived trade name intangible asset | $ 186.1 | $ 52.3
Gross Carrying Amount | 526.4 | 395.1
Accumulated Amortization | 221.7 | 178.7
Net Carrying Amount | $ 304.7 | 216.4
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Customer relationships |  |
Summary of the Company's amortizable intangible assets |  |
Gross Carrying Amount | $ 385.7 | 315.6
Accumulated Amortization | 149.8 | 122.6
Net Carrying Amount | $ 235.9 | 193.0
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Proprietary technology |  |
Summary of the Company's amortizable intangible assets |  |
Gross Carrying Amount | $ 106.7 | 53.8
Accumulated Amortization | 38.4 | 30.9
Net Carrying Amount | $ 68.3 | 22.9
Weighted average useful lives of acquired amortizable intangible assets | 11 years |
License agreements |  |
Summary of the Company's amortizable intangible assets |  |
Gross Carrying Amount | $ 6.0 | 6.0
Accumulated Amortization | $ 6.0 | 6.0
Weighted average useful lives of acquired amortizable intangible assets | 8 years |
Backlog and other |  |
Summary of the Company's amortizable intangible assets |  |
Gross Carrying Amount | $ 28.0 | 19.7
Accumulated Amortization | 27.5 | 19.2
Net Carrying Amount | $ 0.5 | $ 0.5
Weighted average useful lives of acquired amortizable intangible assets | 1 year |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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