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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Cash and Marketable Securities - Components of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	$ 224.0	$ 94.8	$ 69.2	$ 54.4
Restricted Cash	86.9	64.8
Restricted Marketable Securities	72.6	76.1
Total	383.5	235.7
Cash
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	224.0	94.8
Restricted Cash	86.9	64.8
Restricted Marketable Securities	0.0	0.0
Total	310.9	159.6
Equity securities
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents	0.0	0.0
Restricted Cash	0.0	0.0
Restricted Marketable Securities	72.6	63.5
Total	$ 72.6	63.5
Debt securities
Cash and Cash Equivalents [Line Items]
Cash & Cash Equivalents		0.0
Restricted Cash		0.0
Restricted Marketable Securities		12.6
Total		$ 12.6