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Notes Receivable from Asset Sales (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Notes Receivable $ 22.2 $ 22.2
Current portion 22.2 0.0
Notes Receivable, Long-Term Portion 0.0 22.2
Notes Receivable, Fair Value Disclosure $ 23.0 23.0
Senior Notes 2018    
Notes Receivables from Asset Sales, Stated Interest Rate 7.30%  
Notes Receivable $ 22.2 $ 22.2