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Share-Based Compensation Plans (Schedule of Summary of Stock Options) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Shares    
Outstanding, beginning balance (in shares) | shares 14,878,000  
Granted (in shares) | shares 0  
Exercised (in shares) | shares 0  
Forfeited (in shares) | shares 0  
Cancelled (in shares) | shares 14,878,000  
Outstanding, ending balance (in shares) | shares 0 14,878,000
Exercisable, Shares (in shares) | shares 0  
Weighted-Average Exercise Price    
Outstanding, beginning balance (in dollars per share) | $ / shares $ 7.91  
Granted (in dollars per share) | $ / shares 0  
Exercised (in dollars per share) | $ / shares 0  
Forfeited (in dollars per share) | $ / shares 0  
Cancelled (in dollars per share) | $ / shares 7.91  
Outstanding, ending balance, (in dollars per share) | $ / shares 0 $ 7.91
Exercisable, weighted-average exercise price (in dollars per share) | $ / shares $ 0  
Outstanding, weighted-average contractual term, years
Outstanding, exercisable, weighted-average contractual term, years  
Outstanding, aggregate intrinsic value | $ $ 0.0
Exercisable, aggregate intrinsic value | $ $ 0.0