Stockholders' Equity - Follow-on Offering (Details) - Common Stock $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 $ / shares shares
Class of Stock [Line Items]
Common stock sold (in shares) | shares	3,450,000	3,450,000
Offering price | $ / shares	$ 92.00	$ 92.00
Gross proceeds from public offering | $	$ 317.4
Net proceeds from public offering | $	$ 306.8
Underwriters' option to purchase additional shares
Class of Stock [Line Items]
Common stock sold (in shares) | shares	450,000