Leases - Lease Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Finance leases - ROU assets	$ 60.4	$ 55.0
Finance leases - Accumulated depreciation	(32.7)	(31.7)
Operating leases - ROU assets	186.9	156.7
Operating leases - Accumulated depreciation	(100.9)	(86.5)
Total lease assets	113.7	93.5
Finance leases	(6.4)	(7.6)
Operating leases	(29.3)	(24.0)
Finance leases	(22.5)	(16.1)
Operating leases	(64.5)	(49.6)
Total lease liabilities	$ (122.7)	$ (97.3)