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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plan Assets |  |  |
Expected contributions to the defined benefit pension plan in 2020 | $ 4.1 |  |
Net actuarial loss | 56.5 | $ 57.6 |
Expense provision for 401 (k) plans | 4.1 | 4.2 | $ 4.2
Hedge Funds Investments [Member] |  |  |
Pension Plan Assets |  |  |
Investments in hedge funds which do not have readily determinable fair values | 13.5 | 16.5 |
Employee Pension Plans [Member] |  |  |
Pension Plan Assets |  |  |
Other comprehensive gain (loss) | 1.2 | $ 1.1 | $ 2.4
Amount to be amortized from other comprehensive loss into cost in 2020 | $ 2.4 |  |
Discount rate (as a percent) | 3.10% | 4.10% |
Expected return on assets (as a percent) | 5.75% | 6.00% | 6.00%
Other Multiemployer Pension Plans |  |  |
Pension Plan Assets |  |  |
Multiemployer Plan, Period Contributions | $ 31.4 | $ 29.3 | $ 27.8

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