Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Cost	$ 1,825.5	$ 1,671.3
Accumulated depreciation	(550.1)	(470.4)
Net book value	1,275.4	1,200.9	$ 459.1
Land
Property, Plant and Equipment [Line Items]
Cost	610.9	549.2
Accumulated depreciation	0.0	0.0
Net book value	610.9	549.2
Buildings and improvements
Property, Plant and Equipment [Line Items]
Cost	499.6	491.1
Accumulated depreciation	(243.0)	(236.1)
Net book value	256.6	255.0
Yard, automotive and office equipment
Property, Plant and Equipment [Line Items]
Cost	348.1	306.0
Accumulated depreciation	(157.7)	(117.5)
Net book value	190.4	188.5
Computer software and equipment
Property, Plant and Equipment [Line Items]
Cost	109.2	108.2
Accumulated depreciation	(83.0)	(79.5)
Net book value	26.2	28.7
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	174.3	160.0
Accumulated depreciation	(66.4)	(37.3)
Net book value	107.9	122.7
Assets under development
Property, Plant and Equipment [Line Items]
Cost	83.4	56.8
Accumulated depreciation	0.0	0.0
Net book value	$ 83.4	$ 56.8