Leases - Cash flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Leases
Operating cash flows for operating leases	$ 16.2	$ 13.4
Operating cash flows for finance leases	0.2	0.2
Financing cash flows for finance leases	2.6	2.8
Total cash paid for amounts included in the measurement of lease liabilities	19.0	16.4
Finance lease liabilities arising from obtaining right-of-use assets	0.8	4.4
Operating lease liabilities arising from obtaining right-of-use assets	$ 53.8	$ 7.5