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Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) $ in Millions	Dec. 31, 2019 USD ($)
Finance Leases
2020	$ 2.0
2021	2.0
2022	1.4
2023	0.3
2024	0.1
Thereafter	0.0
Total lease payments	5.8
Less imputed interest	0.5
Total	5.3
Operating Leases
2020	77.2
2021	38.7
2022	23.8
2023	12.7
2024	10.3
Thereafter	6.3
Total lease payments	169.0
Less imputed interest	15.4
Total	$ 153.6

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