Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Realized Gain (Loss) on Investments

The proceeds from maturities and sales of available-for-sale debt securities and resulting realized gains and losses are summarized below. In the second quarter of 2020 we liquidated all of our available-for-sale securities and in the third quarter of 2020 we liquidated all available-for-sale debt securities acquired in connection with the Portola acquisition.

	Three months ended
	March 31,
	2021		2020
Proceeds from maturities and sales (1)	$	—	$	812.5
Realized gains	$	—	$	—
Realized losses	$	—	$	—
(1) Proceeds from maturities and sales of available-for-sale debt securities include securities previously classified as cash and cash equivalents and marketable securities in the condensed consolidated balance sheets.