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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | $ 126.6 |  | $ 126.6 |  | $ 92.1
Accumulated amortization | 56.3 |  | 56.3 |  | 49.1
Unamortized intangible assets, gross carrying amount | 35.7 |  | 35.7 |  | 35.7
Intangible assets, net | 106.0 |  | 106.0 |  | 78.7
Amortization expense | 3.9 | $ 3.2 | 7.2 | $ 6.5 |
2021 | 8.6 |  | 8.6 |  |
2022 | 11.8 |  | 11.8 |  |
2023 | 11.2 |  | 11.2 |  |
2024 | 11.2 |  | 11.2 |  |
2025 | 10.8 |  | 10.8 |  |
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Unamortized intangible assets, gross carrying amount | 32.0 |  | 32.0 |  | 32.0
In Process Research and Development [Member] |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Unamortized intangible assets, gross carrying amount | 3.7 |  | 3.7 |  | 3.7
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 2.0 |  | 2.0 |  | 1.0
Accumulated amortization | 0.4 |  | 0.4 |  | 0.4
Patents |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 40.8 |  | 40.8 |  | 40.8
Accumulated amortization | 38.4 |  | 38.4 |  | 36.1
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 39.7 |  | 39.7 |  | 12.0
Accumulated amortization | 6.7 |  | 6.7 |  | 5.2
200000 |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 41.7 |  | 41.7 |  | 36.5
Accumulated amortization | 9.8 |  | 9.8 |  | 6.7
Other |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 2.4 |  | 2.4 |  | 1.8
Accumulated amortization | $ 1.0 |  | $ 1.0 |  | $ 0.7

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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