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Revenue Recognition - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2020 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Interest Income | $ 2.6 | $ 2.1 | $ 5.3 | $ 4.2 |  |
Accounts Receivable [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | 0.0 |  | 0.0 |  |  | $ 0.1
Accounts Receivable, Credit Loss Expense (Reversal) | (0.1) | $ 0.0 | (0.1) | $ 0.2 |  |
Miscellaneous Receivables [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | 4.3 |  | 4.3 |  |  | 4.3
Long-term Customer Receivables |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Long-term Investments and Receivables, Net | $ 11.3 |  | $ 11.3 |  |  | $ 11.1
Scenario, Forecast | One year or longer |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Deferred Revenue |  |  |  |  | $ 5,400.0 |
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months |  |  |  |  | 45.00% |
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months |  |  |  |  | 55.00% |

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