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Revenues - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2020 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Interest Income | $ 2.7 | $ 2.1 |  |
Accounts Receivable [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Allowance for Doubtful Accounts Receivable | 0.1 |  |  | $ 0.1
Provision for Doubtful Accounts | 0.0 | $ 0.2 |  |
Miscellaneous Receivables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Allowance for Doubtful Accounts Receivable | 4.3 |  |  | 4.3
Long-term Customer Receivables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Long-term Investments and Receivables, Net | $ 11.3 |  |  | $ 11.1
Scenario, Forecast | One year or longer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Deferred Revenue |  |  | $ 5,000.0 |
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months |  |  | 47.00% |
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months |  |  | 53.00% |

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