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Goodwill and Other Identifiable Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill for the years ended December 31, 2024 and 2023 by reportable segment were as follows:
In millions | December 31, 2023 | Acquisitions |  |  | Foreign currency translation | December 31, 2024
Flow | $ | 767.1 |  | $ | — |  |  |  | $ | (36.7) |  | $ | 730.4 |
Water Solutions | 1,400.6 |  | — |  |  |  | (7.9) |  | 1,392.7 |
Pool | 1,106.9 |  | 56.6 |  |  |  | — |  | 1,163.5 |
Total goodwill | $ | 3,274.6 |  | $ | 56.6 |  |  |  | $ | (44.6) |  | $ | 3,286.6 |
In millions | December 31, 2022 |  | Purchase accounting adjustments | Foreign currency translation | December 31, 2023 |
Flow | $ | 747.6 |  |  | $ | — |  | $ | 19.5 |  | $ | 767.1 |  |
Water Solutions | 1,398.1 |  |  | (0.8) |  | 3.3 |  | 1,400.6 |  |
Pool | 1,106.9 |  |  | — |  | — |  | 1,106.9 |  |
Total goodwill | $ | 3,252.6 |  |  | $ | (0.8) |  | $ | 22.8 |  | $ | 3,274.6 |  |
Identifiable Intangible Assets | Identifiable intangible assets consisted of the following at December 31:
| 2024 |  | 2023
In millions | Cost | Accumulated amortization | Net |  | Cost | Accumulated amortization | Net
Definite-life intangibles |  |  |  |  |  |  |
Customer relationships | $ | 1,146.5 |  | $ | (400.2) |  | $ | 746.3 |  |  | $ | 1,106.2 |  | $ | (361.8) |  | $ | 744.4 |
Proprietary technology and patents | 88.8 |  | (48.4) |  | 40.4 |  |  | 89.7 |  | (43.2) |  | 46.5 |
Total definite-life intangibles | 1,235.3 |  | (448.6) |  | 786.7 |  |  | 1,195.9 |  | (405.0) |  | 790.9 |
Indefinite-life intangibles |  |  |  |  |  |  |
Trade names | 247.1 |  | — |  | 247.1 |  |  | 251.5 |  | — |  | 251.5 |
Total intangibles | $ | 1,482.4 |  | $ | (448.6) |  | $ | 1,033.8 |  |  | $ | 1,447.4 |  | $ | (405.0) |  | $ | 1,042.4 |
Estimated Future Amortization Expense for Identifiable Intangible Assets | Estimated future amortization expense for identifiable intangible assets during the next five years is as follows:
In millions | 2025 | 2026 | 2027 | 2028 | 2029 |  |
Estimated amortization expense | $ | 57.1 |  | $ | 55.8 |  | $ | 54.5 |  | $ | 52.1 |  | $ | 51.7 |  |  |

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