Leases - Variable Lease Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 1.0		$ 2.8
General and administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	0.2		0.8
Interest expense, net
Lessee, Lease, Cost [Line Items]
Total variable expenses	0.0		0.0
Penn Master Lease
Lessee, Lease, Cost [Line Items]
Total variable expenses	4.4	$ 11.8	29.5	$ 36.8
Penn Master Lease | General and administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	2.3	0.0	15.4	0.0
Penn Master Lease | Interest expense, net
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 2.1	$ 11.8	$ 14.1	$ 36.8