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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 |  |

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