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Employee Benefits Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following table presents additional information about our significant foreign pension plan assets for which we utilize Level 3 inputs to determine fair value.
| Years ended December 31,
Plan assets subject to fair value hierarchy, level 3 | 2017 |  | 2016
Balance at beginning of period | $ | 28.0 |  |  | $ | 31.0 |
Actual return on plan assets | 1.5 |  |  | (3.0 | )
Balance at end of period | $ | 29.5 |  |  | $ | 28.0 |

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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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