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Cash and Marketable Securities - Components of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	$ 69.1	$ 21.8	$ 49.4	$ 185.6
Restricted Cash	35.1	31.6
Restricted Marketable Securities	126.2	110.0
Total	230.4	163.4
Cash
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	69.1	21.8
Restricted Cash	35.1	31.6
Restricted Marketable Securities	0.0	0.0
Total	104.2	53.4
Equity securities
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	0.0	0.0
Restricted Cash	0.0	0.0
Restricted Marketable Securities	126.2	110.0
Total	$ 126.2	$ 110.0

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Total investments of the Company which includes cash, cash equivalents, restricted cash, and marketable securities.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of restricted 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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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