Marketable Securities - Unrealized Loss Position (Details) $ in Millions	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Unrealized loss position, number of positions
Number of held securities in an unrealized loss position | security	103	74
Number of held securities in an unrealized loss position for 12 months or longer | security	33	0
Unrealized loss position, aggregate fair value
Unrealized loss position | $	$ 901.2	$ 750.5
Unrealized loss position for more than 12 months | $	$ 346.4