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Earnings Per Share - Shares of Common Stock Outstanding (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock Outstanding [Roll Forward] |  |  |
Balance, Beginning of Year (in shares) | 186,642,962 |  |
Balance, End of Year (in shares) | 220,440,993 | 186,642,962 |
Common Stock |  |  |
Common Stock Outstanding [Roll Forward] |  |  |
Balance, Beginning of Year (in shares) | 186,642,962 | 198,663,342 | 223,743,322
Issuance Related to Stock-Based Compensation (in shares) | 882,335 | 909,107 | 814,344
Retirement of Common Stock (in shares) | (4,138,527) | (12,929,487) | (25,894,324)
Issuance Related to CNXM Merger (in shares) | 37,054,223 | 0 | 0
Balance, End of Year (in shares) | 220,440,993 | 186,642,962 | 198,663,342

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