The following table provide a summary of assets and liabilities measured at fair value on a recurring basis and as reported in the Consolidated Balance Sheets (in millions):



	Fair Value Measurements at December 31, 2017										Fair Value Measurements at December 31, 2016
	Level 1		Level 2			Level 3		Total			Level 1		Level 2			Level 3		Total
Assets:
Available-for-sale securities:
Asset-backed securities	$	—	$	286.5		$	—	$	286.5		$	—	$	303.0		$	—	$	303.0
Certificates of deposit	—		83.8			—		83.8			—		66.1			—		66.1
Commercial paper	—		217.1			—		217.1			—		147.7			—		147.7
Corporate debt securities	—		927.0			—		927.0			—		844.9			—		844.9
Foreign government debt securities	—		62.7			—		62.7			—		33.9			—		33.9
Money market funds⁽¹⁾	969.8		—			—		969.8			592.2		—			—		592.2
Publicly-traded equity securities	—		—			—		—			4.6		—			—		4.6
Time deposits	—		239.2			—		239.2			—		264.6			—		264.6
U.S. government agency securities	—		143.2			—		143.2			—		126.7			—		126.7
U.S. government securities	322.4		83.6			—		406.0			345.0		45.4			—		390.4
Privately-held debt and redeemable preferred stock securities	—		—			53.3		53.3			—		—			42.3		42.3
Total available-for-sale securities	1,292.2		2,043.1			53.3		3,388.6			941.8		1,832.3			42.3		2,816.4
Trading securities⁽²⁾	27.6		—			—		27.6			21.0		—			—		21.0
Derivative assets:
Foreign exchange contracts	—		9.2			—		9.2			—		0.9			—		0.9
Total assets measured at fair value	$	1,319.8	$	2,052.3		$	53.3	$	3,425.4		$	962.8	$	1,833.2		$	42.3	$	2,838.3
Liabilities:
Derivative liabilities:
Foreign exchange contracts	$	—	$	(1.8	)	$	—	$	(1.8	)	$	—	$	(4.9	)	$	—	$	(4.9	)
Total liabilities measured at fair value	$	—	$	(1.8	)	$	—	$	(1.8	)	$	—	$	(4.9	)	$	—	$	(4.9	)

Total assets, reported as:
Cash equivalents	$	928.1	$	350.9		$	—	$	1,279.0		$	549.4	$	357.7		$	—	$	907.1
Restricted investments	69.4		—			—		69.4			63.9		—			—		63.9
Short-term investments	247.5		778.6			—		1,026.1			178.0		574.3			—		752.3
Long-term investments	74.8		913.6			—		988.4			171.5		900.3			—		1,071.8
Prepaid expenses and other current assets	—		9.2			—		9.2			—		0.9			—		0.9
Other long-term assets	—		—			53.3		53.3			—		—			42.3		42.3
Total assets measured at fair value	$	1,319.8	$	2,052.3		$	53.3	$	3,425.4		$	962.8	$	1,833.2		$	42.3	$	2,838.3

Total liabilities, reported as:
Other accrued liabilities	$	—	$	(1.8	)	$	—	$	(1.8	)	$	—	$	(4.9	)	$	—	$	(4.9	)
Total liabilities measured at fair value	$	—	$	(1.8	)	$	—	$	(1.8	)	$	—	$	(4.9	)	$	—	$	(4.9	)

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⁽¹⁾	Balance includes $41.8 million and $42.9 million of restricted investments measured at fair value, related to the Company's D&O Trust and acquisition-related escrows for the years ended December 31, 2017 and 2016, respectively.


⁽²⁾	Balance relates to restricted investments measured at fair value related to the Company's NQDC plan.