Leases - Schedule of maturities of lease liabilities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Leases Liabilities
2019	$ 72.0
2020	126.0
2021	96.3
2022	76.2
2023	50.7
After 2024	120.6
Total lease payments	541.8
Less: Imputed interest	75.8
Present value of lease liabilities	466.0
Finance Leases Liabilities
2019	1.6
2020	3.2
2021	3.2
2022	2.7
2023	2.1
After 2024	7.0
Total lease payments	19.8
Less: Imputed interest	2.9
Present value of lease liabilities	16.9
Total
2019	73.6
2020	129.2
2021	99.5
2022	78.9
2023	52.8
After 2024	127.6
Total lease payments	561.6
Less: Imputed interest	78.7
Present value of lease liabilities	$ 482.9