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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