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Earnings Per Share - Shares of Common Stock Outstanding (Details) - shares	12 Months Ended
	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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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