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Impairment and restructuring charges - Schedule of Impairment of Long-Lived Assets Held and Used by Asset (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets	$ 27.2	$ 306.7	$ 27.2	$ 306.7	$ 0.0
Buildings, building improvements and leasehold improvements
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets			7.8	81.5
Furniture and equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets			14.1	117.5
Software
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets			0.2	0.3
Construction-in-progress
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of long-lived assets			$ 5.1	$ 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
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-Topic 820
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