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Restructuring and impairment costs - Details of Impairment of Long-Lived Assets Held and Used by Asset (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | $ 306.7 | $ 0.0 | $ 306.7 | $ 0.0
Buildings, building improvements and leasehold improvements |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | 81.5 |  |  |
Furniture and equipment |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | 117.5 |  |  |
Software |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | 0.3 |  |  |
Construction-in-progress |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |
Impairment of long-lived assets | $ 107.4 |  |  |

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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://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 3: 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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