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Revolving Credit Facility and DIP Facility (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Sep. 25, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  | $ 544.8 |  |
Letters of Credit Outstanding, Amount | $ 36.5 |  |  |
Debtor-in-Possession Financing, Amount Arranged |  |  |  | $ 500.0
Reported Value Measurement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 545.3 |  | $ 7,096.3 |
Reported Value Measurement [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | $ 0.0 |  | 581.0 |
Line of Credit [Member] | Reported Value Measurement [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | 581.0 |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount |  |  | 27.0 |
Portion Identified as binding [Member] | Credit Facility due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity |  |  | $ 1,600.0 |

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