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Employee Benefits Tables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined Contribution Plan, Cost | $ 1.7 | $ 1.7 | $ 7.3 | $ 7.3
Deferred Compensation Arrangement with Individual, Compensation Expense | 0.3 | 0.2 | 1.3 | 1.2
Multiemployer Plan, Contributions by Employer | 1.3 | 1.2 | 3.7 | 3.5
Total other employee benefit plans | 4.9 | 4.5 | 17.2 | 16.5
Postretirement Health Coverage | Salaried VEBA |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Total net periodic postretirement benefit cost relating to Salaried VEBA | 1.6 | 1.4 | 4.9 | 4.5
Salaried VEBA: |  |  |  |
Interest cost | 0.8 | 0.7 | 2.4 | 2.1
Expected return on plan assets | (0.7) | (0.8) | (2.0) | (2.2)
Amortization of prior service cost | 1.4 | 1.3 | 4.2 | 4.0
Amortization of net actuarial loss | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.6

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