Long-term Debt (Narrative) (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Interest rate	5.75%
Sensipar and Mimpara-Secured Non-recourse Debt Sensipar Notes
Debt outstanding	$ 26.2	$ 54.4
Debt classified as current	7.4	6.8
Month and year of issue	Sep. 30, 2011
Month and year of amendment	June 2012
Interest rate		9.00%
Effective interest rate		9.00%
Debt amount originally issued		145.0
Net proceeds upon original issuance		144.9
Interest accrued	0.3	0.6
Quarterly limit of royalty offset of the royalty advance	8.0
rhPTH 1-84-Secured Non-recourse Debt
Debt outstanding	42.8	42.8
Month and year of issue	Jul. 31, 2007
Month and year of amendment	2013-12-31
Debt amount originally issued		50.0
Net proceeds upon original issuance		50.0
Interest accrued	6.5	0
Interest and principal paid to date		45.5
REGPARA-Secured Non-recourse Debt
Debt outstanding	31.0	35.2
Debt classified as current	2.8	1.9
Month and year of issue	Feb. 28, 2010
Interest rate		15.60%
Effective interest rate		15.60%
Debt amount originally issued		38.4
Net proceeds upon original issuance		38.4
Deferred debt issuance costs amortization period, in years	10 years
Interest accrued	0.6	1.1
Interest and principal paid to date		$ 36.2