Leases - Components of Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Minimum lease payments	$ 24.4	$ 24.0	$ 51.7	$ 47.8
Variable lease income	4.6	4.6	8.9	8.5
Total operating lease income	29.0	28.6	$ 60.6	$ 56.3
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]			Rental revenues	Rental revenues
Operating lease cost	18.9	21.2	$ 38.1	$ 42.3
Variable lease cost	2.2	1.9	4.1	3.6
Sublease income	$ (27.0)	$ (26.6)	$ (56.5)	$ (53.1)