Equity Method Investments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 04, 2013
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments	$ 58.0	$ 112.8	$ 105.1
Clean energy investments
Schedule of Equity Method Investments [Line Items]
Number of equity method investments	5
Impairment of Equity Method Investments	$ 47.0
Reduction in Equity Method Investment Long-Term Obligation	89.0
Loss from equity method investments	42.0
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 Equity Method Investment, Dividends or Distributions, Return of Capital	$ 8.4