Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2005 USD ($)	Dec. 31, 2004 resident	Oct. 07, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jan. 31, 2012 USD ($)
PFOA Matters [Member]
Loss Contingencies [Line Items]
Accrual balance				$ 14.0
Indemnification assets				14.0
PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Binding settlement agreement, class size | resident		80,000
Loss contingency, potential additional loss				$ 235.0
Escrow deposit					$ 1.0
PFOA Matters: Additional Actions [Member]
Loss Contingencies [Line Items]
Lawsuits alleging personal injury - Filed				3,500
Lawsuits alleging wrongful death				37
PFOA MDL plaintiffs				6
Compensatory damages awarded			$ 1.6
Payment for Plaintiffs Attorney Fees [Member] | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Settlement payments	$ 23.0
Payment to fund community health project [Member] | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Settlement payments	$ 70.0