Leasing - Maturity of lease obligations (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Operating Leases
2020	$ 37.4
2021	41.7
2022	33.5
2023	23.1
2024	14.6
2025 and After	38.0
Total lease payments	188.3
Less: interest	21.4
Present value of lease liabilities, excluding guaranteed residual values	166.9
Plus: Present value of guaranteed residual values	0.0
Present value of lease liabilities	166.9
Finance Leases
2020	19.7
2021	22.3
2022	18.7
2023	9.5
2024	6.8
2025 and After	11.2
Total lease payments	88.2
Less: interest	8.6
Present value of lease liabilities, excluding guaranteed residual values	79.6
Plus: Present value of guaranteed residual values	2.8
Finance lease obligations	82.4	$ 71.2
Total
2020	57.1
2021	64.0
2022	52.2
2023	32.6
2024	21.4
2025 and After	49.2
Total lease payments	$ 276.5