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Stock Compensation - Award Activity (Details)
shares in Millions
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Stock Options [Member]  
Shares  
Outstanding at beginning of period | shares 0.7
Granted | shares
Exercised or vested | shares (0.1)
Forfeited or expired | shares
Outstanding at end of period | shares 0.6
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 15.33
Granted | $ / shares
Exercised or vested | $ / shares 4.80
Forfeited or expired | $ / shares
Outstanding at end of period | $ / shares $ 16.13
Stock Appreciation Rights (SARs) [Member]  
Shares  
Outstanding or Nonvested at beginning of period | shares 0.1
Granted | shares
Exercised or vested | shares
Forfeited or expired | shares
Outstanding or Nonvested at end of period | shares 0.1
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares
Granted | $ / shares
Exercised or vested | $ / shares
Forfeited or expired | $ / shares
Outstanding at end of period | $ / shares $ 16.27
Restricted Stock Units (RSUs) [Member]  
Shares  
Outstanding or Nonvested at beginning of period | shares 1.8
Granted | shares 1.0
Exercised or vested | shares (0.7)
Forfeited or expired | shares (0.1)
Outstanding or Nonvested at end of period | shares 2.0
Weighted-Average Grant-Date Fair Value  
Nonvested at beginning of period | $ / shares $ 20.06
Granted | $ / shares 17.08
Exercised or vested | $ / shares 14.66
Forfeited or expired | $ / shares 20.49
Nonvested at end of period | $ / shares $ 20.56
Performance Share Units [Member]  
Shares  
Outstanding or Nonvested at beginning of period | shares 0.5
Granted | shares 0.4
Exercised or vested | shares (0.2)
Forfeited or expired | shares
Outstanding or Nonvested at end of period | shares 0.7
Weighted-Average Grant-Date Fair Value  
Nonvested at beginning of period | $ / shares $ 22.45
Granted | $ / shares 16.17
Exercised or vested | $ / shares 18.63
Forfeited or expired | $ / shares
Nonvested at end of period | $ / shares $ 19.99