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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - Pension Benefits - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Components of net pension expense: |  |  |  |
Service cost | $ 1,800,000 | $ 1,700,000 | $ 3,800,000 | $ 3,500,000
Interest cost | 4,100,000 | 5,400,000 | 8,300,000 | 10,800,000
Expected return on plan assets | (9,300,000) | (9,200,000) | (18,600,000) | (18,500,000)
Amortization of prior service cost | 600,000 | 400,000 | 1,100,000 | 800,000
Amortization of net actuarial losses | 6,300,000 | 4,600,000 | 12,500,000 | 9,300,000
Net pension expense | 3,500,000 | $ 2,900,000 | 7,100,000 | $ 5,900,000
United States |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Estimated future employer contribution in fiscal year | $ 0 |  | $ 0 |

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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