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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Estimated future employer contribution in fiscal year |  | $ 90.0 |  | $ 90.0 |
Components of net pension expense: |  |  |  |  |
Service cost |  | 1.9 | $ 2.4 | 3.8 | $ 4.9
Interest cost |  | 4.9 | 4.9 | 9.8 | 9.9
Expected return on plan assets |  | (9.6) | (7.7) | (19.3) | (15.5)
Amortization of prior service cost |  | 0.6 | 0.7 | 1.2 | 1.4
Amortization of net actuarial losses |  | 5.8 | 5.7 | 11.7 | 11.4
Net pension expense |  | 3.6 | 6.0 | 7.2 | 12.1
Pension Benefits | United States |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Plan contributions by employer | $ 81.0 |  |  |  |
Other Postretirement Benefits |  |  |  |  |
Components of net pension expense: |  |  |  |  |
Interest cost |  | 0.1 | 0.1 | 0.2 | 0.2
Amortization of net actuarial losses |  | 0.1 | 0.2 | 0.2 | 0.3
Net pension expense |  | $ 0.2 | $ 0.3 | $ 0.4 | $ 0.5

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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