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Goodwill and Other Identifiable Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Goodwill by Segment | 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 |
Detail of Identifiable Intangible Assets | 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 |
Estimated Future Amortization Expense for Identifiable Intangible Assets | 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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