Leases - Components of Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating lease income:
Variable lease income	$ 260.9	$ 268.3	$ 521.2	$ 530.4
Operating Lease, Variable Lease Income	21.7	17.7	42.5	34.5
Operating Lease, Lease Income	282.6	286.0	563.7	564.9
Finance lease income	2.3	1.6	4.5	3.3
Total lease income	284.9	287.6	568.2	568.2
Total operating lease income	$ 18.3	$ 18.9	$ 40.9	$ 35.7