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Goodwill and Other Identifiable Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Identifiable Intangible Assets | Goodwill and Other Identifiable Intangible Assets The changes in the carrying amount of goodwill by reportable segment were as follows:
In millions | December 31, 2018 | Acquisitions | Foreign currency translation/other | June 30, 2019
Aquatic Systems | $ | 965.9 |  | $ | — |  | $ | (1.1 | ) | $ | 964.8 |
Filtration Solutions | 643.5 |  | 214.9 |  | 1.1 |  | 859.5 |
Flow Technologies | 463.3 |  | — |  | (0.1 | ) | 463.2 |
Total goodwill | $ | 2,072.7 |  | $ | 214.9 |  | $ | (0.1 | ) | $ | 2,287.5 |
Identifiable intangible assets consisted of the following:
| June 30, 2019 |  | December 31, 2018
In millions | Cost | Accumulated amortization | Net |  | Cost | Accumulated amortization | Net
Definite-life intangibles |  |  |  |  |  |  |
Customer relationships | $ | 422.6 |  | $ | (258.3 | ) | $ | 164.3 |  |  | $ | 347.1 |  | $ | (247.9 | ) | $ | 99.2 |
Trade names | — |  | — |  | — |  |  | 0.4 |  | (0.4 | ) | — |
Proprietary technology and patents | 49.6 |  | (34.8 | ) | 14.8 |  |  | 86.2 |  | (68.4 | ) | 17.8 |
Total definite-life intangibles | 472.2 |  | (293.1 | ) | 179.1 |  |  | 433.7 |  | (316.7 | ) | 117.0 |
Indefinite-life intangibles |  |  |  |  |  |  |
Trade names | 175.1 |  | — |  | 175.1 |  |  | 159.3 |  | — |  | 159.3 |
Total intangibles | $ | 647.3 |  | $ | (293.1 | ) | $ | 354.2 |  |  | $ | 593.0 |  | $ | (316.7 | ) | $ | 276.3 |
Identifiable intangible asset amortization expense was $8.3 million and $9.1 million for the three months ended June 30, 2019 and 2018, respectively, and $16.5 million and $18.4 million for the six months ended June 30, 2019 and 2018, respectively. Estimated future amortization expense for identifiable intangible assets during the remainder of 2019 and the next five years is as follows:
| Q3-Q4 |  |  |  |  |
In millions | 2019 | 2020 | 2021 | 2022 | 2023 | 2024
Estimated amortization expense | $ | 16.0 |  | $ | 27.6 |  | $ | 22.5 |  | $ | 15.3 |  | $ | 13.0 |  | $ | 12.4 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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