Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of lease cost
Amortization of right-of-use assets	$ 4.6	$ 4.1	$ 3.3
Interest on lease liabilities	0.9	1.0	0.6
Total finance lease cost	5.5	5.1	3.9
Operating lease cost	45.4	31.4	20.4
Short term lease cost	5.7	4.4	5.6
Variable lease cost	8.1	6.2	5.0
Impairment expense	1.3	3.2	0.0
Sublease income	(2.3)	(2.0)	(1.7)
Total lease cost	$ 63.7	$ 48.3	$ 33.2