Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Cost	$ 2,180.1	$ 1,825.5
Accumulated depreciation	(657.8)	(550.1)
Net book value	1,522.3	1,275.4
Land
Property, Plant and Equipment [Line Items]
Cost	749.4	610.9
Accumulated depreciation	0.0	0.0
Net book value	749.4	610.9
Buildings and improvements
Property, Plant and Equipment [Line Items]
Cost	618.1	499.6
Accumulated depreciation	(268.5)	(243.0)
Net book value	349.6	256.6
Yard, automotive and office equipment
Property, Plant and Equipment [Line Items]
Cost	418.8	348.1
Accumulated depreciation	(201.8)	(157.7)
Net book value	217.0	190.4
Computer software and equipment
Property, Plant and Equipment [Line Items]
Cost	117.9	109.2
Accumulated depreciation	(94.2)	(83.0)
Net book value	23.7	26.2
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	209.5	174.3
Accumulated depreciation	(93.3)	(66.4)
Net book value	116.2	107.9
Assets under development
Property, Plant and Equipment [Line Items]
Cost	66.4	83.4
Accumulated depreciation	0.0	0.0
Net book value	$ 66.4	$ 83.4