Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory [Line Items]
Inventories	$ 66.2	$ 81.9
Sugar inventories
Inventory [Line Items]
Inventories	9.4	23.3
Work in process - sugar
Inventory [Line Items]
Inventories	11.6	0.0
Asphalt
Inventory [Line Items]
Inventories	16.8	21.3
Processed rock, portland cement, and sand
Inventory [Line Items]
Inventories	12.6	15.7
Work in process
Inventory [Line Items]
Inventories	3.3	2.8
Retail merchandise
Inventory [Line Items]
Inventories	1.6	1.5
Parts, materials and supplies inventories
Inventory [Line Items]
Inventories	$ 10.9	$ 17.3