Write-downs, Reserves, and Project Opening Costs, net of Recoveries - Components (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Write-downs, Reserves, and Project Opening Costs, net of Recoveries [Abstract]
Write-downs, reserves, and project opening costs, net of recoveries	$ 19.2	$ 0.5	$ 95.1	$ 44.7