Leases - Schedule of operating lease liabilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases Liabilities
2019	$ 36.0
2020	131.0
2021	100.9
2022	80.6
2023	54.1
After 2024	126.0
Total lease payments	528.6
Less: Imputed interest	73.1
Present value of lease liabilities	455.5
Finance Leases Liabilities
2019	0.9
2020	3.6
2021	3.6
2022	3.1
2023	2.3
After 2024	7.1
Total lease payments	20.6
Less: Imputed interest	2.7
Present value of lease liabilities	17.9
Total
2019	36.9
2020	134.6
2021	104.5
2022	83.7
2023	56.4
After 2024	133.1
Total lease payments	549.2
Less: Imputed interest	75.8
Present value of lease liabilities	$ 473.4