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Savings, Pension and Other Postretirement Employee Benefit Plans - Multiemployer Defined Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost | $ 5.7 | $ 5.6 | $ 5.7
IAM |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List] | No |  |
Multiemployer Plan, Pension, Significant, Plan Number | 002 |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost | $ 0.3 | $ 0.3 | 0.3
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date | May 31, 2023 |  |
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List] | Red | Red |
USW |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List] | No |  |
Multiemployer Plan, Pension, Significant, Plan Number | 001 |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost | $ 5.5 | $ 5.3 | $ 5.4
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date | Aug. 31, 2025 |  |
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List] | Red | Red |

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