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Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 14 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2005 USD ($) | Dec. 31, 2015 USD ($) lawsuits | Sep. 30, 2016 USD ($) cases lawsuits | Dec. 31, 2004 resident | Dec. 31, 2017 cases | Jan. 31, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency accrual, period increase |  |  | $ 5.0 |  |  |
PFOA Matters [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrual balance |  |  | 18.0 |  |  |
Indemnification assets |  |  | 18.0 |  |  |
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 | 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PFOA MDL plaintiff cases voluntarily withdrawn |  |  | 1 |  |  |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 |
Number of cases starting May 2017 | cases |  |  |  |  | 38 |
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 |  |  |

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