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Employee Benefits Tables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure |  |  |  |
Total net periodic postretirement benefit cost relating to Salaried VEBA |  |  | $ 4.6 | $ 3.4
Gain on removal of Union VEBA net assets | $ 0.0 | $ 0.5 | 0.0 | (0.8)
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Defined Contribution Plan, Cost | 1.7 | 1.4 | 7.3 | 7.5
Deferred Compensation Arrangement with Individual, Compensation Expense | 0.2 | 0.5 | 1.2 | 1.4
Multiemployer Plan, Contributions by Employer | 1.2 | 1.1 | 3.5 | 3.4
Total other employee benefit plans | 4.5 | 4.7 | 16.5 | 14.9
Postretirement Health Coverage | Salaried VEBA |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Total net periodic postretirement benefit cost relating to Salaried VEBA | 1.4 | 1.2 | 4.5 | 3.4
Salaried VEBA: |  |  |  |
Interest cost | 0.7 | 0.8 | 2.1 | 2.3
Expected return on plan assets | (0.8) | (1.0) | (2.2) | (3.1)
Amortization of prior service cost | 1.3 | 1.2 | 4.0 | 3.6
Amortization of net actuarial loss | 0.2 | 0.2 | 0.6 | 0.6
Postretirement Health Coverage | Union VEBA |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Gain on removal of Union VEBA net assets | $ 0.0 | $ (0.5) | $ 0.0 | $ 0.8

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