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Revenue Recognition - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2022 | Jun. 30, 2021 | Dec. 31, 2019
Accounts Receivable [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 0.0 |  | $ 0.0 |  |  |  | $ 0.0
Accounts Receivable, Credit Loss Expense (Reversal) | 0.0 | $ (0.1) | 0.0 | $ (0.1) |  |  |
Miscellaneous Receivables [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 0.0 |  | $ 0.0 |  |  |  | $ 0.0
Scenario, Forecast | One year or longer |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Deferred Revenue |  |  |  |  |  | $ 4,100.0 |
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months |  |  |  |  |  | 43.00% |
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months |  |  |  |  | 57.00% |  |

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