Leases - Finance lease costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating lease costs	$ 35.8	$ 36.5	$ 19.2
Amortization of finance lease right-of-use assets	14.5	14.5	14.5
Interest on finance lease liabilities	39.1	46.1	45.0
Total finance lease costs	53.6	60.6	59.5
Total lease cost	$ 89.4	$ 97.1	$ 78.7