Long-term Debt (Narrative) (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Convertible Notes
Debt outstanding	$ 16.5	$ 16.5
Debt classified as current	16.5
Month and year of issue	Aug. 31, 2007
Number of interest payments, per year		4
Effective interest rate		5.90%
Debt amount originally issued		50.0
Net proceeds upon original issuance		49.4
Deferred debt issuance costs amortization period, in years		7 years
Interest accrued	0	0
Debt due date	August 7, 2014
Conversion price of 5.75% convertible notes, per share	$ 5.44
Sensipar and Mimpara-Secured Non-recourse Debt Sensipar Notes
Debt outstanding	54.4	80.2
Debt classified as current	6.8	6.3
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	0.6	0.9
Quarterly limit of royalty offset of the royalty advance	8.0
PTH 1-84-Secured Non-recourse Debt
Debt outstanding	42.8	42.8
Month and year of issue	Jul. 31, 2007
Debt amount originally issued		50.0
Net proceeds upon original issuance		50.0
Interest accrued	0	0
Interest and principal paid to date		45.5
REGPARA-Secured Non-recourse Debt
Debt outstanding	35.2	36.3
Debt classified as current	1.9	0
Month and year of issue	Feb. 28, 2010
Interest rate		15.70%
Effective interest rate		15.70%
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	1.1	3.1
Interest and principal paid to date		$ 27.9