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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Intangible assets |  |
Indefinite-lived trade name intangible asset | $ 186.1 | $ 186.1
Gross Carrying Amount | 531.4 | 521.8
Accumulated Amortization | 257.8 | 233.5
Net Carrying Amount | $ 273.6 | 288.3
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Customer relationships |  |
Intangible assets |  |
Gross Carrying Amount | $ 390.0 | 381.1
Accumulated Amortization | 178.6 | 159.1
Net Carrying Amount | $ 211.4 | 222.0
Weighted average useful lives of acquired amortizable intangible assets | 10 years |
Proprietary technology |  |
Intangible assets |  |
Gross Carrying Amount | $ 107.4 | 106.7
Accumulated Amortization | 45.7 | 40.9
Net Carrying Amount | $ 61.7 | 65.8
Weighted average useful lives of acquired amortizable intangible assets | 11 years |
Backlog and other |  |
Intangible assets |  |
Gross Carrying Amount | $ 34.0 | 34.0
Accumulated Amortization | 33.5 | 33.5
Net Carrying Amount | $ 0.5 | $ 0.5
Weighted average useful lives of acquired amortizable intangible assets | 2 years |

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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 Accumulated amount of 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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- 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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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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