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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
	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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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