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Debt Long term debt (Tables)
 6 Months Ended
Jun. 30, 2016
Long-term Debt, Unclassified [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block]
Estimated future principal payments, interest, and fees due under the Loan and Security Agreement are as follows:
 
Years Ending December 31,
(in millions)
2016
$
0.4

2017
6.8

2018
3.0

Total
$
10.2