Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended								12 Months Ended			104 Months Ended
	Jan. 19, 2021	Jan. 04, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Subsequent Event [Line Items]
Cash dividends paid per share of common stock (in dollars per share)			$ 0.650	$ 0.250	$ 0.250	$ 0.250	$ 0.220	$ 0.220	$ 0.215	$ 0.215	$ 1.40	$ 0.87	$ 0.77
Options Granted (in shares)														13,104,021
Options vesting and exercisable period, maximum											8 years
Options termination period											10 years
Total intrinsic value of stock options exercised											$ 26.7	$ 20.2	$ 4.2
Total unrecognized stock-based compensation expense			$ 12.6								$ 12.6			$ 12.6
Weighted average period over which total unrecognized stock-based compensation expense will be recognized											3 years 10 months 13 days
Total grant date fair value of stock options vested											$ 6.1	5.9	5.3
Total stock-based compensation expense											$ 5.7	$ 5.7	$ 5.1
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per share of common stock (in dollars per share)	$ 0.28
Options Granted (in shares)		714,867
Option Exercise (Strike) Price (in dollars per share)		$ 48.00
Closing Stock Price on Date of Grant (in dollars per share)		$ 47.65
Subsequent Event | Non-employee Director Options Elected
Subsequent Event [Line Items]
Options Granted (in shares)		26,643
Option Exercise (Strike) Price (in dollars per share)		$ 48.00