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Goodwill and Other Intangible Assets, Net | 6 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets, Net | Goodwill and Other Intangible Assets, Net The change in the carrying amount of goodwill was as follows:
(in millions) |  |  |
Balance at December 31, 2024 |  |  | $ | 51.5 |
Foreign currency translation |  |  | 0.1 |
Balance at June 30, 2025 |  |  | $ | 51.7 |
The gross carrying amount, accumulated amortization and net book value of intangible assets at the end of each period were as follows:
| June 30, 2025 |  | December 31, 2024
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Customer relationships | $ | 43.2 |  |  | $ | (34.7) |  |  | $ | 8.5 |  |  | $ | 43.1 |  |  | $ | (33.5) |  |  | $ | 9.6 |
Internal-use software | 56.6 |  |  | (12.4) |  |  | 44.2 |  |  | 52.4 |  |  | (15.6) |  |  | 36.8 |
Developed technology | 27.4 |  |  | (5.9) |  |  | 21.5 |  |  | 27.4 |  |  | (4.9) |  |  | 22.5 |
Patents | 36.3 |  |  | (8.2) |  |  | 28.1 |  |  | 36.2 |  |  | (6.5) |  |  | 29.6 |
Total intangible assets | $ | 163.5 |  |  | $ | (61.3) |  |  | $ | 102.3 |  |  | $ | 159.1 |  |  | $ | (60.6) |  |  | $ | 98.5 |
Amortization expense for intangible assets was $2.6 million and $2.4 million for the three months ended June 30, 2025 and 2024, respectively, and was $5.0 million and $4.8 million for the six months ended June 30, 2025 and 2024, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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