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Other Long-term Liabilities - Components of Deferred Revenue (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred Revenue Arrangement [Line Items] |  |  |
Total deferred revenue | $ 168.5 | $ 172.0 | $ 175.5
Splitter Agreement [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Total deferred revenue | 129.0 | 129.0 |
Gas Contract Amendment [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Total deferred revenue | 37.3 | 39.8 |
Other Deferred Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Total deferred revenue | $ 2.2 | $ 3.2 |

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