Cash, Cash Equivalents and Short-Term Investments (Tables)

3 Months Ended

Mar. 31, 2020

Cash and Cash Equivalents [Abstract]

Schedule of cash, cash equivalents and short-term investments

The amortized cost, unrealized gains and losses and estimated fair value of the Company's cash, cash equivalents and available-for-sale securities as of March 31, 2020 and December 31, 2019 consisted of the following:

	As of March 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash	$	112.1	$	—	$	—		$	112.1
Cash equivalents
Money market funds	373.0		—		—			373.0
Commercial paper	1.3		—		—			1.3
Total cash and cash equivalents	$	486.4	$	—	$	—		$	486.4
Short-term investments
Corporate notes and obligations	289.0		0.6		(2.7		)	286.9
U.S. Treasury securities	173.3		2.1		—			175.4
Asset-backed securities	59.1		0.1		(0.7		)	58.5
Certificates of deposit	30.8		—		—			30.8
Commercial Paper	21.4		—		—			21.4
U.S. agency obligations	15.3		0.2		—			15.5
Supranational securities	2.8		—		—			2.8
Municipal securities	2.5		—		—			2.5
Total available-for-sale securities	594.2		3.0		(3.4		)	593.8
Total	$	1,080.6	$	3.0	$	(3.4	)	$	1,080.2

	As of December 31, 2019
	Amortized cost		Unrealized gain		Unrealized loss			Estimated fair value
Cash	$	105.0	$	—	$	—		$	105.0
Cash equivalents:
Money market funds	444.3		—		—			444.3
Commercial paper	2.0		—		—			2.0
Total cash and cash equivalents	$	551.3	$	—	$	—		$	551.3
Investments								—
Corporate notes and obligations	285.5		1.2		(0.1		)	286.6
U.S. Treasury securities	171.0		0.3		—			$	171.3
Asset backed securities	53.8		—		—			53.8
Certificates of deposit	38.2		—		—			38.2
U.S. agency obligations	27.2		—		—			$	27.2
Commercial paper	24.2		—		—			24.2
Supranational securities	4.0		—		—			4.0
Municipal securities	2.4		—		—			2.4
Total short-term investments	606.3		1.5		(0.1		)	607.7
Total	$	1,157.6	$	1.5	$	(0.1	)	$	1,159.0

Contractual maturities of short term investments

The following table presents the contractual maturities of the Company’s available for sale securities as of March 31, 2020:

	As of March 31, 2020
	Amortized cost		Estimated fair value
Due within one year	288.3		289.1
Due between one to three years	280.8		280.1
Due after three years	25.1		24.6
Total	$	594.2	$	593.8