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Employee Benefit Plans - Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure |  |  |
Accrued pension liability | $ 8.6 | $ 9.4 |
Estimated net periodic pension expense to be amortized over the next fiscal year | 0.9 |  |
Projected benefit obligation | 62.5 | 58.5 | $ 53.6
Fair value of plan assets | 53.9 | 49.1 | 42.8
Multiemployer plan, contributions by employer | 0.5 | 0.5 | 0.4
Defined contribution expense | 4.9 | 8.7 | 8.2
Compensation expense | 0.3 | 0.3 | $ 0.4
Hudson |  |  |
Defined Benefit Plan Disclosure |  |  |
Accrued pension liability | 1.0 | 0.8 |
Projected benefit obligation | 2.9 | 2.9 |
Fair value of plan assets | $ 2.0 | $ 2.0 |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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