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Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Nonrecurring Fair Value Measurements [Member]    
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract]    
Indicators of Impairment $ 0.0 $ 0.0