Leases - Variable Lease Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
General and administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 2.5	$ 3.9
Penn Master Lease
Lessee, Lease, Cost [Line Items]
Total variable expenses	24.7	32.5	$ 48.9
Penn Master Lease | General and administrative
Lessee, Lease, Cost [Line Items]
Total variable expenses	12.9	16.4	0.0
Penn Master Lease | Interest expense, net
Lessee, Lease, Cost [Line Items]
Total variable expenses	$ 11.8	$ 16.1	$ 48.9