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Share-Based Compensation Plans (Schedule of Summary of Performance Restricted Stock Units) (Details) - Performance Restricted Stock Units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Performance Restricted Stock Units  
Nonvested, beginning balance (in shares) | shares 2,982,000
Granted (in shares) | shares 0
Vested (in shares) | shares 0
Forfeited (in shares) | shares 0
Modified (in shares) | shares (2,982,000)
Nonvested, ending balance (in shares) | shares 0
Weighted-Average Grant-Date Fair Value  
Nonvested, beginning balance (in dollars per share) | $ / shares $ 1.98
Granted (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 0
Modified (in dollars per share) | $ / shares (1.98)
Nonvested, ending balance (in dollars per share) | $ / shares $ 0