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Commitments and Contingencies Asbestos Narrative (Details) - Asbestos [Member] | 3 Months Ended | 9 Months Ended | 30 Months Ended | 351 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) cases claimants | Sep. 30, 2019 USD ($) claimants | Jun. 30, 2020 USD ($) claimants | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) claimants | Dec. 31, 2019 claimants
Loss Contingencies [Line Items] |  |  |  |  |  |
Liabilities Subject to Compromise, Asbestos Obligations | $ 27,900,000 |  |  |  |  |
Loss Contingency, Pending Cases, Number | cases | 347 |  |  |  |  |
Loss Contingency, Pending Claims, Number | claimants | 4,676 |  |  |  | 4,655 | 4,759
Total settlement costs |  |  |  | $ 10,300,000 |  |
Loss Contingency, New Claims Filed, Number | claimants | 62 | 219 |  |  |  |
Percentage of settlement and defense costs covered by insurance |  |  |  | 40.00% |  |
Legal Fees | $ 530,000 | $ 2,130,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liabilities Subject to Compromise, Asbestos Obligations |  |  |  |  | $ 31,500,000 |
Loss Contingency, New Claims Filed, Number | claimants |  |  | 143 |  |  |
Legal Fees |  |  | $ 2,200,000 |  |  |
Maximum [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Liabilities Subject to Compromise, Asbestos Obligations |  |  |  |  | $ 43,300,000 |
Loss Contingency, New Claims Filed, Number | claimants |  |  | 173 |  |  |
Legal Fees |  |  | $ 2,300,000 |  |  |
Compensatory Only Damages [Member] | Pending Litigation [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of pending claims seeking specific amounts of damages | claimants | 34 |  |  |  |  |

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