Leases - Future lease obligations (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating leases
2022	$ 29.6
2023	27.4
2024	26.0
2025	19.1
2026	14.5
Thereafter	26.4
Total lease payments	143.0
Less interest	10.0
Total	133.0	$ 144.6
Finance leases
2022	0.6
2023	0.6
2024	0.6
2025	0.4
Total lease payments	2.2
Less interest	0.1
Total	$ 2.1	$ 2.1