Leases - Net operating lease cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lease Cost
Operating lease cost	$ 65.2	$ 63.8	$ 129.6	$ 127.2
Sublease income	(4.3)	(4.6)	(8.5)	(9.7)
Total lease cost	$ 60.9	$ 59.2	$ 121.1	$ 117.5