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Commitments and Contingent Liabilities (Litigation) (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 14 Months Ended
Jul. 31, 2005
USD ($)
Jun. 30, 2016
USD ($)
cases
lawsuits
Dec. 31, 2015
USD ($)
Dec. 31, 2004
resident
Dec. 31, 2017
cases
Jan. 31, 2012
USD ($)
Loss Contingencies [Line Items]            
Loss contingency accrual, period increase   $ 5.0        
PFOA Matters [Member]            
Loss Contingencies [Line Items]            
Accrual balance   19.0        
Indemnification assets   19.0        
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
Minimum escrow amount per settlement agreement           $ 0.5
Escrow amount disbursed (less than)   $ 1.0        
Lawsuits alleging personal injury - Filed | lawsuits   3,500        
Lawsuits alleging wrongful death | lawsuits   30        
PFOA MDL plaintiffs | cases   6        
PFOA MDL plaintiff cases tried to a verdict that have been or will be appealed | cases   2        
PFOA MDL plaintiff cases voluntarily withdrawn   1        
PFOA MDL plaintiff cases resolved | cases   4        
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          
Scenario, Forecast [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Number of cases for trial through 2017 | cases         40  
Kidney cancer [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   200        
PFOA MDL plaintiff cases settled for immaterial amounts | cases   2        
Kidney cancer [Member] | Compensatory [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Damages Awarded, Value     $ 1.6      
Testicular cancer [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   70        
Testicular cancer [Member] | Compensatory [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Damages Awarded, Value   $ 5.1        
Testicular cancer [Member] | Punitive [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Damages Awarded, Value   $ 0.5        
Ulcerative colitis [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   300        
Preeclampsia [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   200        
Thyroid disease [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   1,430        
High cholesterol [Member] | PFOA Matters: Drinking Water Actions [Member]            
Loss Contingencies [Line Items]            
Lawsuits alleging personal injury - Filed | lawsuits   1,340