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Equity Method Investments (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 04, 2013
Schedule of Equity Method Investments [Line Items]          
Loss from equity method investments $ 21.7 $ 24.9 $ 54.9 $ 55.8  
Equity method investments summarized financial data basis     100.00%    
Clean energy investments          
Schedule of Equity Method Investments [Line Items]          
Number of equity method investments 5   5    
Sagent Agila | Agila Specialties | Equity method investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage         50.00%
Loss from equity method investments $ 5.7        
Proceeds from Sagent Agila's joint venture dissolution     $ 8.4