Leases - Balance sheet by asset category (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating lease ROU Asset	$ 86.8	$ 44.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Property, plant and equipment, gross	$ 777.1	$ 691.6
Less: Accumulated depreciation	(480.0)	(436.8)
Property, plant and equipment, net	297.1	254.8	$ 248.2
Finance Leased Asset
Lessee, Lease, Description [Line Items]
Less: Accumulated depreciation	(9.7)	(6.8)
Property, plant and equipment, net	2.4	4.2
Finance Leased Automobile
Lessee, Lease, Description [Line Items]
Property, plant and equipment, gross	0.1	0.1
Finance Leased Machinery and Equipment
Lessee, Lease, Description [Line Items]
Property, plant and equipment, gross	12.0	10.9
Real Estate
Lessee, Lease, Description [Line Items]
Operating lease ROU Asset	81.9	39.4
Automobile
Lessee, Lease, Description [Line Items]
Operating lease ROU Asset	4.1	4.1
Machinery and equipment.
Lessee, Lease, Description [Line Items]
Operating lease ROU Asset	$ 0.8	$ 1.4