Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Financial Assets

The following table represents our fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of March 31, 2016 (in millions):

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
Cash equivalents	$	—	$	32.6	$	—	$	32.6
Marketable securities, available for sale
U.S. government agencies	—		22.8		—		22.8
Corporate debt	—		4.3		—		4.3
Commercial paper	—		1.5		—		1.5
Total marketable securities, available for sale	$	—	$	28.6	$	—	$	28.6

The following table represents our fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of December 31, 2015 (in millions):

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
Cash equivalents	$	—	$	32.1	$	—	$	32.1
Marketable securities, available for sale
U.S. government agencies	—		22.1		—		22.1
Corporate debt	—		4.9		—		4.9
Commercial paper	—		2.1		—		2.1
Total marketable securities, available for sale	$	—	$	29.1	$	—	$	29.1