Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Finance Leases
2023	$ 0.7
2024	0.4
2025	0.0
2026	0.0
2027	0.0
Thereafter	0.0
Total lease payments	1.1
Less imputed interest	0.0
Total	1.1	$ 2.7
Operating Leases
2023	28.0
2024	19.7
2025	9.0
2026	4.2
2027	0.8
Thereafter	0.1
Total lease payments	61.8
Less imputed interest	6.1
Total	$ 55.7	$ 81.5