Impact of COVID-19 - Balance Sheet, Cash Flow and Liquidity Narrative (Details) - USD ($)
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12 Months Ended |
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Dec. 31, 2020 |
Mar. 31, 2021 |
Jun. 30, 2020 |
May 12, 2020 |
Mar. 30, 2020 |
| Unusual or Infrequent Item, or Both [Line Items] |
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| Liquidity |
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$ 1,940,800,000
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| ATM Program |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Number of shares sold (in shares) |
9,000,000
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| Consideration received on sale of shares |
$ 156,700,000
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| Common Stock | Public Offering |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Number of shares sold (in shares) |
20,125,000
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| Consideration received on sale of shares |
$ 192,400,000
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| 8.00% senior secured notes due in 2025 |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Stated interest rate |
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8.00%
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| 8.00% Senior Secured Notes Due 2025 | 8.00% senior secured notes due in 2025 |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Principal amount |
$ 850,000,000
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| Stated interest rate |
8.00%
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8.00%
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| 4.75% Convertible Senior Notes | Convertible debt |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Principal amount |
$ 175,000,000.0
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$ 175,000,000.0
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| Stated interest rate |
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4.75%
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| 2022 Revolving Credit Facility | Line of Credit | Revolving credit facilities |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Line of credit facility, maximum borrowing capacity |
$ 180,000,000.0
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| Revolving credit facility due in 2024 | Line of Credit | Revolving credit facilities |
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| Unusual or Infrequent Item, or Both [Line Items] |
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| Line of credit facility, maximum borrowing capacity |
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$ 240,000,000.0
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$ 180,000,000.0
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$ 110,000,000.0
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| Line of credit facility, remaining borrowing capacity |
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$ 60,000,000.0
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$ 60,000,000.0
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