Leases - Variable Lease Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 3.9
Interest Expense, net
Lessee, Lease, Cost [Line Items]
Total variable expenses	0.0
General and Administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	1.1
Penn Master Lease
Lessee, Lease, Cost [Line Items]
Total variable expenses	32.5	$ 48.9	$ 46.8
Penn Master Lease | Interest Expense, net
Lessee, Lease, Cost [Line Items]
Total variable expenses	16.1	48.9	46.8
Penn Master Lease | General and Administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 16.4	$ 0.0	$ 0.0