Segment financial information - reconciliation of reconciliation of net income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reconciliation of Adjusted EBITDA from net income or loss
Adjusted Operating Income	$ 190.6	$ 242.8
Amortization	(75.7)	(73.9)
Reserve for certain legal matters, net	(0.4)	0.0
Other	0.1	(1.7)
Interest expense, net	(42.9)	(42.2)
Loss on extinguishment of debt	0.6	0.0
Other (expense) income, net	(0.5)	(19.5)
Income before income taxes	55.5	85.7
Business Exit Costs And Employee Severance
Reconciliation of Adjusted EBITDA from net income or loss
Restructuring charges	(15.1)	(4.4)
External Advisors
Reconciliation of Adjusted EBITDA from net income or loss
Restructuring charges	$ 0.0	$ (15.4)