Write-downs, Reserves, and Project Opening Costs, net of Recoveries (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cost of Property Repairs and Maintenance	$ 3.2	$ 6.9	$ 7.2	$ 19.0
Gain (Loss) on Disposition of Property Plant Equipment	6.7	12.1	15.3	13.9
Project opening costs	11.3	2.9	24.4	4.6
Other	(4.8)	1.5	(6.5)	6.6
Write-downs, reserves, and project opening costs, net of recoveries	56.7	23.4	80.7	44.1
Council Bluffs, Iowa [Member]
Business Exit Costs Fair Value	$ 40.3	$ 0	$ 40.3	$ 0