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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) LegalMatter claims | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) claims | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of pending claims (legal matter) | claims | 674 |  | 687 |
Number of claims dismissed | claims | 74 |  |  |
Number of claims settled (claim) | claims | 4 |  |  |
Claims settlements amount | $ 2.5 |  |  |
Asbestos-related claims | $ 75.9 |  | $ 76.2 |
Recorded third-party environmental recoveries receivable |  |  | $ 69.2 |
Primary coverage period | 8 years |  |  |
Excess coverage period | 2 years |  |  |
Indemnity and defense costs | $ 0.3 |  |  |
Connecticut Voluntary Corrective Action Program (VCAP) |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual |  |  |  | $ 3.2
Connecticut Voluntary Corrective Action Program |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimated total cleanup costs, accrual | 1.7 |  |  |
Loss contingency accrual, period decrease |  | $ (0.9) |  |
Environmental remediation expense | 0.6 |  |  |
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 | 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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