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Goodwill and Other Identifiable Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2016
Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by segment were as follows:
In millions | December 31, 2015 | Purchase accounting adjustments | Foreign currency translation/other | September 30, 2016
Water Quality Systems | $ | 1,121.1 |  | $ | — |  | $ | 6.0 |  | $ | 1,127.1 |
Flow & Filtration Solutions | 882.7 |  | — |  | 13.7 |  | 896.4 |
Technical Solutions | 2,255.2 |  | (30.9 | ) | 3.9 |  | 2,228.2 |
Total goodwill | $ | 4,259.0 |  | $ | (30.9 | ) | $ | 23.6 |  | $ | 4,251.7 |
Detail of Identifiable Intangible Assets | Identifiable intangible assets consisted of the following:
| September 30, 2016 |  | December 31, 2015
In millions | Cost | Accumulated amortization | Net |  | Cost | Accumulated amortization | Net
Finite-life intangibles |  |  |  |  |  |  |
Customer relationships | $ | 1,491.3 |  | $ | (332.6 | ) | $ | 1,158.7 |  |  | $ | 1,482.9 |  | $ | (266.9 | ) | $ | 1,216.0 |
Trade names | 1.9 |  | (1.4 | ) | 0.5 |  |  | 1.8 |  | (1.2 | ) | 0.6 |
Proprietary technology and patents | 145.5 |  | (100.1 | ) | 45.4 |  |  | 144.1 |  | (89.8 | ) | 54.3 |
Total finite-life intangibles | 1,638.7 |  | (434.1 | ) | 1,204.6 |  |  | 1,628.8 |  | (357.9 | ) | 1,270.9 |
Indefinite-life intangibles |  |  |  |  |  |  |
Trade names | 478.4 |  | — |  | 478.4 |  |  | 476.5 |  | — |  | 476.5 |
Total intangibles, net | $ | 2,117.1 |  | $ | (434.1 | ) | $ | 1,683.0 |  |  | $ | 2,105.3 |  | $ | (357.9 | ) | $ | 1,747.4 |
Estimated Future Amortization Expense for Identifiable Intangible Assets | Estimated future amortization expense for identifiable intangible assets during the remainder of 2016 and the next five years is as follows:
| Q4 |  |  |  |  |
In millions | 2016 | 2017 | 2018 | 2019 | 2020 | 2021
Estimated amortization expense | $ | 21.3 |  | $ | 85.2 |  | $ | 85.0 |  | $ | 84.3 |  | $ | 82.1 |  | $ | 78.9 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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