Long-term Debt (Narrative) (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Interest rate	5.75%
Sensipar and Mimpara-Secured Non-recourse Debt Sensipar Notes
Debt outstanding	$ 33.5	$ 54.4
Debt classified as current	7.3	6.7
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	0.4	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	4.8	0
Interest and principal paid to date		45.5
REGPARA-Secured Non-recourse Debt
Debt outstanding	31.0	35.2
Debt classified as current	0	0
Month and year of issue	Feb. 28, 2010
Interest rate		15.40%
Effective interest rate		15.40%
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	1.1
Interest and principal paid to date		$ 36.2