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Stock Compensation - Award Activity (Details)
shares in Millions
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Stock Options [Member]  
Shares  
Outstanding at beginning of period | shares 1.8
Granted | shares
Exercised or vested | shares (0.1)
Forfeited or expired | shares (0.2)
Outstanding at end of period | shares 1.5
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 14.50
Granted | $ / shares
Exercised or vested | $ / shares 11.74
Forfeited or expired | $ / shares 16.31
Outstanding at end of period | $ / shares $ 14.56
Stock Appreciation Rights (SARs) [Member]  
Shares  
Outstanding at beginning of period | shares 0.3
Granted | shares
Exercised or vested | shares
Forfeited or expired | shares
Outstanding at end of period | shares 0.3
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 15.46
Granted | $ / shares
Exercised or vested | $ / shares
Forfeited or expired | $ / shares
Outstanding at end of period | $ / shares $ 15.42
Restricted Stock Units (RSUs) [Member]  
Shares  
Outstanding at beginning of period | shares 1.3
Granted | shares 1.2
Exercised or vested | shares (0.6)
Forfeited or expired | shares (0.1)
Outstanding at end of period | shares 1.8
Weighted-Average Grant-Date Fair Value  
Outstanding at beginning of period | $ / shares $ 20.09
Granted | $ / shares 13.31
Exercised or vested | $ / shares 16.51
Forfeited or expired | $ / shares 16.75
Outstanding at end of period | $ / shares $ 16.54
Performance Share Units [Member]  
Shares  
Outstanding at beginning of period | shares 0.4
Granted | shares 0.4
Exercised or vested | shares
Forfeited or expired | shares (0.2)
Outstanding at end of period | shares 0.6
Weighted-Average Grant-Date Fair Value  
Outstanding at beginning of period | $ / shares $ 22.92
Granted | $ / shares 13.21
Exercised or vested | $ / shares
Forfeited or expired | $ / shares 22.61
Outstanding at end of period | $ / shares $ 16.31