Segment Information (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Revenues from unconsolidated joint business in percentage	12.00%	16.00%	21.00%
Long-lived assets related to operations in Denmark	$ 1,765.7	$ 1,750.7	$ 1,742.2
Segment Information (Textual) [Abstract]
Number of reportable segment	1
Distributor One
Revenue from External Customer [Line Items]
Entity wide percentage of revenue from major distributors	33.00%	32.00%	20.00%
Distributor Two
Revenue from External Customer [Line Items]
Entity wide percentage of revenue from major distributors	27.00%	24.00%	10.00%
DENMARK
Revenue from External Customer [Line Items]
Long-lived assets related to operations in Denmark	$ 676.0	$ 731.1	$ 713.4