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12. Commitments & Contingent Liabilities Net Periodic Benefit Cost (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] | Components of Net Periodic Benefit Cost The following sets forth the net periodic benefit cost (income) for the periods indicated (in millions):
| 2017 | 2016 | 2015
Service costs | $6.5 | $6.1 | $5.3
Interest costs | 1.1 |  | 1.4 |  | 1.4 |
Expected returns on plan assets | (1.1 | ) | (1.0 | ) | (1.2 | )
Amortization of actuarial losses | 1.4 |  | 1.7 |  | 0.8 |
Amortization of prior service costs | — |  | — |  | 0.4 |
Settlements | 1.2 |  | 0.4 |  | — |
Net periodic benefit costs | $9.1 | $8.6 | $6.7

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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