Leases - Schedule of Lease costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases
Fixed operating lease cost	$ 20.1	$ 18.7	$ 55.7	$ 56.2
Short-term operating lease cost	2.4	2.2	7.2	6.0
Variable operating lease cost	0.5	7.5	3.3	13.5
Amortization of finance lease assets	0.1	0.2	0.6	0.6
Interest on lease liabilities	0.1	0.1	0.2	1.3
Total lease cost	$ 23.2	$ 28.7	$ 67.0	$ 77.6