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Goodwill and Other Intangible Assets, Net | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets, Net | Goodwill and Other Intangible Assets, Net Goodwill The change in the carrying amount of goodwill for the period is as follows:
| Years Ended December 31,
(in millions) | 2024 |  | 2023
Goodwill at beginning of the year | $ | 51.7 |  |  | $ | 51.7 |
Foreign currency translation | (0.2) |  |  | — |
Goodwill at end of the year | $ | 51.5 |  |  | $ | 51.7 |
Intangible Assets, Net The gross carrying amount, accumulated amortization and net book value of intangible assets at the end of each period were as follows:
| As of December 31,
2024 |  | 2023
(in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Customer relationships | $ | 43.1 |  |  | $ | (33.5) |  |  | $ | 9.6 |  |  | $ | 43.2 |  |  | $ | (30.9) |  |  | $ | 12.3 |
Internal-use software | 52.4 |  |  | (15.6) |  |  | 36.8 |  |  | 43.1 |  |  | (13.9) |  |  | 29.2 |
Developed technology | 27.4 |  |  | (4.9) |  |  | 22.5 |  |  | 27.4 |  |  | (3.0) |  |  | 24.4 |
Patents | 36.2 |  |  | (6.6) |  |  | 29.6 |  |  | 36.2 |  |  | (3.4) |  |  | 32.8 |
Total intangible assets | $ | 159.1 |  |  | $ | (60.6) |  |  | $ | 98.5 |  |  | $ | 149.9 |  |  | $ | (51.2) |  |  | $ | 98.7 |
Amortization expense for intangible assets was $9.8 million, $10.2 million, and $7.2 million for the years ended December 31, 2024, 2023, and 2022, respectively. In February 2023, the Company paid Bigfoot Biomedical, Inc. $25.1 million, including transaction costs, to acquire patent assets related to pump-based automated insulin delivery technologies. The acquired patent assets have a useful life of 11 years. Amortization expense associated with the intangible assets included on the Company’s consolidated balance sheet as of December 31, 2024 is expected to be as follows:
Years Ending December 31, | (in millions)
2025 | $ | 14.2 |
2026 | $ | 15.1 |
2027 | $ | 14.0 |
2028 | $ | 12.9 |
2029 | $ | 12.3 |

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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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