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Benefit Plans and Other Postretirement Benefits, Net pension expense (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. |  |  |  |
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |  |
Rate of compensation increase (as a percent) |  | 3.00% | 3.00% | 3.00%
International Plans |  |  |  |
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |  |
Rate of compensation increase (as a percent) |  | 1.63% | 1.61% | 1.45%
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Plan contributions by employer |  | $ 22.5 | $ 22.2 | $ 20.9
Components of net pension expense: |  |  |  |
Service cost |  | 9.6 | 9.0 | 9.3
Interest cost |  | 20.0 | 20.9 | 22.8
Expected return on plan assets |  | (30.7) | (30.1) | (29.1)
Amortization of prior service cost |  | 2.7 | 2.4 | 2.3
Amortization of net actuarial losses |  | 22.9 | 22.0 | 25.7
Net pension expense |  | 24.5 | 24.2 | 31.0
Pension Benefits | U.S. |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Plan contributions by employer | $ 80.0 | 16.5 | 16.4 |
Components of net pension expense: |  |  |  |
Service cost |  | 6.7 | 6.2 | 6.5
Interest cost |  | 15.3 | 15.4 | 17.4
Expected return on plan assets |  | (27.2) | (26.2) | (25.9)
Amortization of prior service cost |  | 2.7 | 2.4 | 2.3
Amortization of net actuarial losses |  | 18.3 | 18.6 | 21.5
Net pension expense |  | $ 15.8 | $ 16.4 | $ 21.8
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |  |
Discount rate (as a percent) |  | 3.93% | 4.11% | 3.75%
Expected long-term return on assets (as a percent) |  | 7.75% | 7.75% | 8.00%
Pension Benefits | International Plans |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Plan contributions by employer |  | $ 6.0 | $ 5.8 |
Components of net pension expense: |  |  |  |
Service cost |  | 2.9 | 2.8 | $ 2.8
Interest cost |  | 4.7 | 5.5 | 5.4
Expected return on plan assets |  | (3.5) | (3.9) | (3.2)
Amortization of net actuarial losses |  | 4.6 | 3.4 | 4.2
Net pension expense |  | $ 8.7 | $ 7.8 | $ 9.2
Weighted average assumptions used to determine net periodic benefit cost/expense: |  |  |  |
Discount rate (as a percent) |  | 2.28% | 2.96% | 2.91%
Expected long-term return on assets (as a percent) |  | 3.80% | 4.29% | 5.47%

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- Definition Amount of gain (loss) 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -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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