Leases - Lease Obligations (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Finance leases - ROU assets	$ 37.5	$ 36.0
Finance leases - Accumulated depreciation	(15.3)	(14.9)
Operating leases - ROU assets	195.5	203.1
Operating leases - Accumulated depreciation	(115.2)	(116.6)
Total lease assets	102.5	107.6
Finance leases	(7.1)	(6.7)
Operating leases	(27.4)	(29.2)
Finance leases	(13.8)	(12.8)
Operating leases	(61.8)	(66.7)
Total lease liabilities	$ (110.1)	$ (115.4)