Leases - Future Minimum Lease Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leases
2019 (excluding the nine months ended September 30, 2019)	$ 106.7
2020	420.1
2021	399.9
2022	396.9
2023	393.7
Thereafter	8,457.0
Total lease payments	10,174.3
Less: Imputed interest	(5,610.8)
Present value of future lease payments	4,563.5
Less: Current portion of lease obligations	(124.4)	$ (102.3)	$ 0.0
Long-term portion of lease obligations	4,439.1	3,704.4	0.0
Finance Leases
2019 (excluding the nine months ended September 30, 2019)	5.4
2020	21.4
2021	21.4
2022	21.4
2023	20.5
Thereafter	403.8
Total lease payments	493.9
Less: Imputed interest	(269.8)
Present value of future lease payments	224.1
Less: Current portion of lease obligations	(6.3)	(5.8)	0.0
Long-term portion of lease obligations	217.8	218.3	0.0
Financing Obligations
2019 (excluding the nine months ended September 30, 2019)	97.4
2020	374.7
2021	367.3
2022	367.3
2023	367.3
Thereafter	9,638.0
Total lease payments	11,212.0
Less: Imputed interest	(7,055.9)
Present value of future lease payments	4,156.1
Less: Current portion of lease obligations	(45.3)	(50.1)	(67.8)
Long-term portion of lease obligations	$ 4,110.8	$ 4,144.2	$ 7,080.6