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Benefit Plans and Other Postretirement Benefits, Defined benefit plans (Details) - Pension Benefits - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Components of net pension expense: |  |  |  |  |
Service cost |  | $ 1,700,000 | $ 1,900,000 | $ 3,500,000 | $ 3,800,000
Interest cost |  | 5,400,000 | 4,900,000 | 10,800,000 | 9,800,000
Expected return on plan assets |  | (9,200,000) | (9,600,000) | (18,500,000) | (19,300,000)
Amortization of prior service cost |  | 400,000 | 600,000 | 800,000 | 1,200,000
Amortization of net actuarial losses |  | 4,600,000 | 5,800,000 | 9,300,000 | 11,700,000
Net pension expense |  | 2,900,000 | $ 3,600,000 | 5,900,000 | $ 7,200,000
United States |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Estimated future employer contribution in fiscal year |  | $ 0 |  | $ 0 |
Employer contributions | $ 81,000,000.0 |  |  |  |

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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 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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