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Employee Benefits Schedule of Net Benefit Costs (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | Net Periodic Cost The components of net periodic benefit cost and key assumptions are listed below.
| Domestic Pension Plan |  | Foreign Pension Plans |  | Domestic Postretirement Benefit Plan
Years ended December 31, | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Service cost | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 4.9 |  |  | $ | 4.8 |  |  | $ | 5.4 |  |  | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 0.0 |
Interest cost | 3.7 |  |  | 4.8 |  |  | 4.5 |  |  | 9.4 |  |  | 12.4 |  |  | 13.1 |  |  | 0.8 |  |  | 1.2 |  |  | 1.1 |
Expected return on plan assets | (5.7) |  |  | (5.9) |  |  | (6.6) |  |  | (18.8) |  |  | (17.4) |  |  | (18.8) |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |
Settlement and curtailment | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | (0.1) |  |  | 0.0 |  |  | (1.0) |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | 0.0 |  |  | (0.2) |  |  | (0.2) |
Net actuarial losses | 1.7 |  |  | 1.9 |  |  | 1.6 |  |  | 5.4 |  |  | 4.8 |  |  | 5.9 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |
Net periodic cost | $ | (0.3) |  |  | $ | 0.8 |  |  | $ | (0.5) |  |  | $ | 0.9 |  |  | $ | 4.7 |  |  | $ | 4.7 |  |  | $ | 1.0 |  |  | $ | 1.1 |  |  | $ | 1.0 |
Assumptions
| Domestic Pension Plan |  | Foreign Pension Plans |  | Domestic Postretirement Benefit Plan
Years ended December 31, | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Net periodic cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 3.35 | % |  | 4.35 | % |  | 3.70 | % |  | 1.84 | % |  | 2.61 | % |  | 2.36 | % |  | 3.25 | % |  | 4.30 | % |  | 3.65 | %
Rate of compensation increase | N/A |  | N/A |  | N/A |  | 2.51 | % |  | 2.58 | % |  | 2.37 | % |  | N/A |  | N/A |  | N/A
Expected return on plan assets | 6.00 | % |  | 7.00 | % |  | 7.00 | % |  | 4.70 | % |  | 4.76 | % |  | 4.70 | % |  | N/A |  | N/A |  | N/A
Interest crediting rates | 5.10 | % |  | 5.10 | % |  | 5.10 | % |  | 1.37 | % |  | 1.44 | % |  | 1.31 | % |  | N/A |  | N/A |  | N/A
Benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 2.60 | % |  | 3.35 | % |  | 4.35 | % |  | 1.35 | % |  | 1.84 | % |  | 2.61 | % |  | 2.50 | % |  | 3.25 | % |  | 4.30 | %
Rate of compensation increase | N/A |  | N/A |  | N/A |  | 2.47 | % |  | 2.51 | % |  | 2.58 | % |  | N/A |  | N/A |  | N/A
Interest crediting rates | 5.10 | % |  | 5.10 | % |  | 5.10 | % |  | 1.50 | % |  | 1.37 | % |  | 1.44 | % |  | N/A |  | N/A |  | N/A
Health care cost trend rate assumed for next year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial rate (weighted-average) |  |  |  |  |  |  |  |  |  |  |  |  | 6.75 | % |  | 7.00 | % |  | 6.25 | %
Year ultimate rate is reached |  |  |  |  |  |  |  |  |  |  |  |  | 2028 |  | 2028 |  | 2024
Ultimate rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.00 | % |  | 5.00 | % |  | 5.00 | %

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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