Acquisitions & Divestitures Divestitures (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Second Quarter Property Divestitures [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 140.2
Gain (Loss) on Sale of Property	97.4
Third Quarter Property Divestitures [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	68.8
Gain (Loss) on Sale of Property	$ 17.5