Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Carrying Values Estimated Fair Values of Notes and Facility Financing Obligation

The following is a summary of the carrying values and estimated fair values of the 2018 notes, the facility financing obligation (i.e., the 2019 notes and Tranche B notes), and the Sanofi Loan Facility (in millions):

	December 31, 2015				December 31, 2014
	Carrying value		Estimated fair value		Carrying value		Estimated fair value
2015 notes	$	—	$	—	$	99.4	$	102.9
2018 notes	$	27.6	$	21.3	$	—	$	—
Facility financing obligation	$	74.6	$	78.4	$	73.0	$	75.1
Sanofi Loan Facility	$	44.5	$	36.5	$	3.0	$	3.0