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Impairment and restructuring charges - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2024 employee | May 31, 2024 employee positions | Aug. 31, 2023 employee | Jan. 31, 2023 employee | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | $ 0.0 | $ 27.2 | $ 0.0 | $ 306.7 | $ 27.2 | $ 306.7
January 2023 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  |  |  | 125 |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 9.3 |  |  |  | 9.3 |
August 2023 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  |  | 400 |  |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 19.4 |  |  |  | 19.4 |
May 2024 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  | 300 |  |  |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 20.0 |  |  |  | 20.0 |
Number of currently vacant positions eliminated | positions |  | 85 |  |  |  |  |  |  |  |
August 2024 Restructuring Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Workforce reduction | employee | 70 |  |  |  |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | $ 3.5 |  |  |  | $ 3.5 |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + 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 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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