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Assets held for sale (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Aug. 16, 2024
Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets held for sale (see note 17) $ 216.5   $ 0.0
Liabilities held for sale (see note 17) 101.7   $ 0.0
Disposal Group, Held-for-Sale, Not Discontinued Operations | Clinical Services      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Consideration from assets held for sale   $ 595.0  
Consideration from assets held for sale, net of tax   $ 500.0  
Assets held for sale (see note 17) 216.5    
Liabilities held for sale (see note 17) $ 101.7