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Employee Retirement Plans (Multiemployer Pension Plans) (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) plan | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Multiemployer Plans [Line Items] |  |  |
Number of underfunded plans | plan | 2 |  |
Withdrawal obligation | $ 37.0 |  |
Payments to multiemployer pension plans | 9.4 | $ 7.8 |
Other Long-Term Liabilities |  |  |
Multiemployer Plans [Line Items] |  |  |
Withdrawal obligation | 33.1 |  | $ 35.7
Other Current Liabilities |  |  |
Multiemployer Plans [Line Items] |  |  |
Withdrawal obligation | $ 3.9 |  | $ 8.4

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