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Debt Long term debt (Tables)
9 Months Ended
Sep. 30, 2015
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)
2015
$
0.3

2016
5.3

2017
6.7

2018
6.2

Total
$
18.5