Significant Accounting Policies - Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory [Line Items]
Inventories	$ 68.1	$ 23.5
Sugar inventories
Inventory [Line Items]
Inventories	16.8	3.9
Asphalt
Inventory [Line Items]
Inventories	17.9	0
Processed rock, portland cement, and sand
Inventory [Line Items]
Inventories	12.9	0
Work in progress
Inventory [Line Items]
Inventories	2.7	0
Retail merchandise
Inventory [Line Items]
Inventories	1.8	0
Parts, materials and supplies inventories
Inventory [Line Items]
Inventories	$ 16.0	$ 19.6