Property, plant and equipment, net - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	$ 509.4	$ 509.5
Less: Accumulated depreciation and amortization	(310.0)	(304.1)
Total property, plant and equipment, net	199.4	205.4
Land and improvements
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	20.7	20.7
Buildings, building improvements and leasehold improvements
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	160.5	160.5
Furniture and equipment
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	261.8	259.8
Software
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	62.0	61.9
Construction-in-progress
Property, Plant and Equipment [Abstract]
Property, plant and equipment, gross	$ 4.4	$ 6.6