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Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The Company's intangible as sets consist of products acquired via business combinations or asset acquisitions. The following table summarizes the carrying amount of the Company's intangible assets and goodwill, net of accumulated amortization:
| June 30, 2019
| Estimated Life (years) | Cost |  | Measurement Period Adjustment |  | Additions |  | Gross Total |  | Accumulated Amortization |  | Net
Intangible assets, net | 5-22 | $ | 818.4 |  |  | $ | — |  |  | $ | 10.0 |  |  | $ | 828.4 |  |  | $ | (86.0 | ) |  | $ | 742.4 |
IPR&D | indefinite | 50.0 |  |  | (9.0 | ) |  | — |  |  | 41.0 |  |  | — |  |  | 41.0 |
Goodwill | indefinite | 259.7 |  |  | 8.6 |  |  | — |  |  | 268.3 |  |  | — |  |  | 268.3 |
| December 31, 2018
| Estimated Life (years) | Cost |  | Measurement Period Adjustment |  | Additions |  | Gross Total |  | Accumulated Amortization |  | Net
Intangible assets, net | 5-22 | $ | 151.4 |  |  | $ | — |  |  | $ | 667.0 |  |  | $ | 818.4 |  |  | $ | (56.8 | ) |  | $ | 761.6 |
IPR&D | indefinite | 50.0 |  |  | — |  |  | — |  |  | 50.0 |  |  | — |  |  | 50.0 |
Goodwill | indefinite | 49.1 |  |  | — |  |  | 210.6 |  |  | 259.7 |  |  | — |  |  | 259.7 |
During the six months ended June 30, 2019 and 2018, the Company recorded amortization expense for intangible assets of $29.2 million and $7.8 million, respectively. During the three months ended June 30, 2019 and 2018, the Company recorded amortization expense for intangible assets of $14.7 million and 3.9 million, respectively. As of June 30, 2019, the weighted average amortization period remaining for intangible assets was 14.0 years. IPR&D assets are considered to be indefinite-lived until the completion or abandonment of the associated research and development efforts.

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- Definition The entire disclosure for all or part of the information related to 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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