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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) LegalMatter claims | Dec. 31, 2016 claims | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Environmental remediation expense |  | $ 0.5 |  |
Number of pending claims (legal matter) | claims |  | 616 | 605 |
Asbestos forecast claim period |  | 10 years | 10 years |
Connecticut Voluntary Corrective Action Program |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual |  | $ 1.8 |  | $ 3.2
Loss contingency accrual, period decrease | $ 0.9 |  |  |
Superfund Sites Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual |  | $ 0.4 |  |
Number of pending claims (legal matter) | LegalMatter |  | 1 |  |
Estimated total cleanup costs, cost sharing percentage (percent) |  | 2.00% |  |
PCB Contamination Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for environmental loss contingencies |  | $ 0.2 |  |
Minimum | Superfund Sites Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, maximum possible loss |  | 18.8 |  |
Maximum | Superfund Sites Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, maximum possible loss |  | $ 29.6 |  |

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