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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | $ 160.8 |  | $ 160.8 |  | $ 160.8
Accumulated amortization | 43.5 |  | 43.5 |  | 35.4
Intangible assets, net | 149.3 |  | 149.3 |  | 157.4
Amortization expense | 4.1 | $ 4.2 | 8.1 | $ 8.6 |
2023 | 8.1 |  | 8.1 |  |
2024 | 16.0 |  | 16.0 |  |
2025 | 16.0 |  | 16.0 |  |
2026 | 15.2 |  | 15.2 |  |
2027 | 12.8 |  | 12.8 |  |
Finite-Lived Intangible Asset, Expected Amortization, after Year Five | 49.2 |  | 49.2 |  |
Finite-Lived Intangible Assets, Net | 117.3 |  | 117.3 |  |
Proceeds from Sale of Other Assets |  |  | 0.0 | $ 7.2 |
Payments for Commissions |  |  | 1.8 |  |
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Unamortized intangible assets, gross carrying amount | 32.0 |  | 32.0 |  | 32.0
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 15.2 |  | 15.2 |  | 15.2
Accumulated amortization | 2.3 |  | 2.3 |  | 1.7
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 118.5 |  | 118.5 |  | 118.5
Accumulated amortization | 33.4 |  | 33.4 |  | 27.3
Unpatented Technology [Member] |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 26.3 |  | 26.3 |  | 26.3
Accumulated amortization | 7.4 |  | 7.4 |  | 6.0
Other |  |  |  |  |
Finite-Lived Intangible Assets |  |  |  |  |
Gross carrying amount | 0.8 |  | 0.8 |  | 0.8
Accumulated amortization | $ 0.4 |  | $ 0.4 |  | $ 0.4

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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