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Commitments and Contingencies Legal Proceedings (Details) - 12 months ended Dec. 31, 2017 ¥ in Millions, $ in Millions | CNY (¥) | USD ($) | USD ($)
--- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Damages Sought, Value | ¥ 64.8 | $ 9.9 |
Loss Contingency, Estimate of Possible Loss | 30.0 |  | $ 4.6
Loss Contingency Accrual | 53.9 |  | $ 8.3
Loss Contingency Accrual, Period Increase (Decrease) | ¥ 23.9 | $ 3.7 |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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