Leases (Maturities of Operating and Financing Lease Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Operating leases
2020 (remainder of year)	$ 41.6
2021	67.6
2022	55.9
2023	47.9
2024	40.3
2025	34.0
Thereafter	117.4
Total payments	404.7
Less: present value discount	(52.2)
Present value of lease payments	352.5	$ 545.1
Current portion	73.3
Noncurrent portion	279.2
Finance leases
2020 (remainder of year)	48.8
2021	91.1
2022	89.0
2023	91.5
2024	54.1
2025	49.5
Thereafter	243.0
Total payments	667.0
Less: present value discount	(152.6)
Present value of lease payments	514.4	$ 617.1
Current portion	61.8
Noncurrent portion	$ 452.6