Leases - Net operating lease cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Lease Cost
Operating lease cost	$ 67.7	$ 63.7	$ 201.1	$ 193.3
Sublease income	(4.4)	(4.2)	(12.0)	(12.7)
Total lease cost	$ 63.3	$ 59.5	$ 189.1	$ 180.6