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Segment financial information - reconciliation of segment profitability measure (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reconciliation of Adjusted EBITDA from net income or loss    
Net income $ 121.5 $ 190.4
Interest expense 73.7 64.8
Income tax expense 34.3 51.4
Depreciation and amortization 101.1 114.5
Loss on extinguishment of debt 2.3 1.8
Net foreign currency gain (loss) from financing activities (0.2) 0.1
Other stock-based compensation expense (benefit) 0.1 (1.3)
Integration-related expenses 8.7 3.9
Purchase accounting adjustments 0.0 (4.4)
Restructuring and severance charges 4.7 1.9
Adjusted EBITDA $ 346.2 $ 423.1