Borrowings (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) contract	Feb. 11, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 12, 2014 USD ($)	Jun. 30, 2014 USD ($)	Nov. 11, 2013 USD ($)
Line of Credit Facility [Line Items]
Long-term borrowings	$ 73.9		$ 0.0
Short-term borrowings	2,229.9		850.0
Borrowing, Long-term and Short-term ,Combined Amount	$ 2,303.8		850.0
2013 Facilities Agreement
Line of Credit Facility [Line Items]
Facility agreement initiation date	Nov. 11, 2013
Facilitiy agreement total amount	$ 400.0				$ 400.0	$ 2,600.0
Number of term loan facilities | contract	2
Short-term borrowings	$ 400.0		850.0
2015 Facility Agreement
Line of Credit Facility [Line Items]
Facility agreement initiation date	Jan. 11, 2015
Facilitiy agreement total amount		$ 850.0			$ 850.0
Facility agreement expiration date	Jan. 10, 2016
Short-term borrowings	$ 850.0		0.0
Secured Non-recourse Debts
Line of Credit Facility [Line Items]
Long-term borrowings	73.9		0.0
Short-term borrowings	9.9		0.0
Sensipar and Mimpara Debt, Amgen
Line of Credit Facility [Line Items]
Principal amount	145.0
Regpara Debt, DRI
Line of Credit Facility [Line Items]
Debt instrument, maximum obligation	96.0
PTH-184 Debt, DRI
Line of Credit Facility [Line Items]
Debt instrument, maximum obligation	$ 125.0
Term loan facility one | 2013 Facilities Agreement
Line of Credit Facility [Line Items]
Term loan facility						1,750.0
Term loan facilitly two | 2013 Facilities Agreement
Line of Credit Facility [Line Items]
Facility agreement expiration date	Nov. 11, 2015
Term loan facility						$ 850.0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Facility agreement initiation date	Dec. 12, 2014
Facility agreement expiration date	Dec. 12, 2019
Swingline Facility	$ 250.0
Principal amount				$ 2,100.0
Short-term borrowings	920.0		0.0
Short term uncommitted lines of credit
Line of Credit Facility [Line Items]
Short-term borrowings	$ 50.0		$ 0.0