Investments - Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost Due within 1 year	$ 9.4
Amortized Cost After 1 year but within 5 years	37.3
Amortized Cost After 5 years but within 10 years	0.0
Amortized Cost Due after 10 years	6.6
Amortized Cost	53.3	$ 56.4
Fair Value
Fair Value Due within 1 year	9.4
Fair Value After 1 year but within 5 years	38.0
Fair Value After 5 years but within 10 years	0.0
Fair Value Due after 10 years	6.6
Available-for-sale securities, fair value	$ 54.0	$ 57.7

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Fair Value [Abstract]

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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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