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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) claims LegalMatter | Dec. 31, 2016 claims | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of pending claims (legal matter) | claims | 592 | 605 |
Asbestos forecast claim period | 10 years | 10 years |
Connecticut Voluntary Corrective Action Program |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated total cleanup costs, accrual | $ 1.9 |  | $ 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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