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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plan Assets |  |  |
Expected contributions to the defined benefit pension plan in 2019 | $ 4.6 |  |
Net actuarial loss | 57.6 | $ 58.7 |
Expense provision for 401 (k) plans | 4.2 | 4.2 | $ 4.0
Hedge Funds Investments [Member] |  |  |
Pension Plan Assets |  |  |
Investments in hedge funds which do not have readily determinable fair values | 16.5 | 30.7 |
Employee Pension Plans [Member] |  |  |
Pension Plan Assets |  |  |
Other comprehensive gain (loss) | 1.1 | $ 2.4 | $ 4.3
Amount to be amortized from other comprehensive loss into cost in 2019 | $ 1.9 |  |
Discount rate (as a percent) | 4.10% | 3.50% |
Expected return on assets (as a percent) | 6.00% | 6.00% | 6.00%
Other Multiemployer Pension Plans |  |  |
Pension Plan Assets |  |  |
Multiemployer Plan, Period Contributions | $ 29.3 | $ 27.8 | $ 48.3

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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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