| **Investment In and Advances to Unconsolidated Affiliates - Balance Sheet of Equity Method Investments (Details) - USD ($) $ in Millions** | Dec. 31, 2021 | Dec. 31, 2020 |
|--------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Assets**                                                                                                                                 |          |          |
| Current assets                                                                                                                             | $ 501.5       | $ 235.1       |
| Property and equipment, net                                                                                                                | 994.9         | 1,082.1       |
| Other assets, net                                                                                                                          | 18.9          | 21.2          |
| Total assets                                                                                                                               | 2,981.6       | 2,686.4       |
| **Liabilities and Members' Deficit**                                                                                                       |          |          |
| Current liabilities                                                                                                                        | 395.0         | 424.2         |
| Long-term debt                                                                                                                             | 1,968.0       | 1,622.3       |
| Other liabilities                                                                                                                          | 52.6          | 45.8          |
| Members' deficit                                                                                                                           | 307.7         | 349.8         |
| Total liabilities and shareholders' equity                                                                                                 | 2,981.6       | 2,686.4       |
| Equity Method Investment, Nonconsolidated Investee or Group of Investees                                                                   |          |          |
| **Assets**                                                                                                                                 |          |          |
| Current assets                                                                                                                             | 96.0          | 132.8         |
| Property and equipment, net                                                                                                                | 312.3         | 267.5         |
| Other assets, net                                                                                                                          | 264.1         | 244.9         |
| Total assets                                                                                                                               | 672.4         | 645.2         |
| **Liabilities and Members' Deficit**                                                                                                       |          |          |
| Current liabilities                                                                                                                        | 95.3          | 133.5         |
| Long-term debt                                                                                                                             | 786.9         | 753.5         |
| Other liabilities                                                                                                                          | 20.6          | 42.3          |
| Members' deficit                                                                                                                           | (230.4)       | (284.1)       |
| Total liabilities and shareholders' equity                                                                                                 | $ 672.4       | $ 645.2       |

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| - Definition
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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