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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000.0	5,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares outstanding (in shares)	93,500,000	92,300,000
Common stock, shares issued (in shares)	93,500,000	92,300,000
Common stock, shares authorized (in shares)	220,000,000.0	220,000,000.0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Short-term investments
Amortized cost	$ 612.4	$ 557.3
Long-term investments
Amortized cost	$ 226.7	$ 299.3

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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