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Variable Interest Entities (Details)
$ in Millions
Jan. 01, 2016
USD ($)
Variable Interest Entity [Line Items]  
Variable interest entity, total assets $ 37.4
Variable interest entity, total liabilities 8.2
Variable interest entity, long-term debt 1.4
Letters of credit outstanding 13.5
VIE  
Variable Interest Entity [Line Items]  
Letters of credit outstanding $ 1.4