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Cash and Marketable Securities - Components of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash & Cash Equivalents | $ 94.8 | $ 69.2 | $ 54.4 | $ 40.5
Restricted Cash | 64.8 | 64.3 |  |
Restricted Marketable Securities | 76.1 | 62.0 |  |
Total | 235.7 | 195.5 |  |
Cash |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash & Cash Equivalents | 94.8 | 69.2 |  |
Restricted Cash | 64.8 | 64.3 |  |
Restricted Marketable Securities | 0.0 | 0.0 |  |
Total | 159.6 | 133.5 |  |
Equity Securities |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash & Cash Equivalents | 0.0 | 0.0 |  |
Restricted Cash | 0.0 | 0.0 |  |
Restricted Marketable Securities | 63.5 | 55.6 |  |
Total | 63.5 | 55.6 |  |
Debt Securities |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash & Cash Equivalents | 0.0 | 0.0 |  |
Restricted Cash | 0.0 | 0.0 |  |
Restricted Marketable Securities | 12.6 | 6.4 |  |
Total | $ 12.6 | $ 6.4 |  |

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