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Retirement Benefit Plans - Asset Allocations (Details) - Pension Plan [Member] | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 100.00% | 100.00%
United States | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 11.00% | 9.00%
United States | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 53.00% | 50.00%
United States | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 36.00% | 41.00%
Non-US [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 100.00% | 100.00%
Non-US [Member] | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 8.00% | 5.00%
Non-US [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 44.00% | 47.00%
Non-US [Member] | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 48.00% | 48.00%
Minimum [Member] | United States | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0 |
Minimum [Member] | United States | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.45 |
Minimum [Member] | United States | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.25 |
Minimum [Member] | Non-US [Member] | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0 |
Minimum [Member] | Non-US [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.43 |
Minimum [Member] | Non-US [Member] | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.46 |
Maximum [Member] | United States | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.15 |
Maximum [Member] | United States | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.65 |
Maximum [Member] | United States | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.45 |
Maximum [Member] | Non-US [Member] | Real estate and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.1 |
Maximum [Member] | Non-US [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.53 |
Maximum [Member] | Non-US [Member] | Equity securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Allocation Percentage | 0.56 |

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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 Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + 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)(i) -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 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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