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Stock Compensation - Award Activity (Details)
shares in Millions
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock Options [Member]  
Shares  
Outstanding at beginning of period | shares 1.5
Granted | shares
Exercised or vested | shares (0.7)
Forfeited or expired | shares
Outstanding at end of period | shares 0.8
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 14.56
Granted | $ / shares
Exercised or vested | $ / shares 14.54
Forfeited or expired | $ / shares
Outstanding at end of period | $ / shares $ 14.58
Stock Appreciation Rights (SARs) [Member]  
Shares  
Outstanding at beginning of period | shares 0.3
Granted | shares
Exercised or vested | shares (0.2)
Forfeited or expired | shares
Outstanding at end of period | shares 0.1
Weighted- Average Exercise Price  
Outstanding at beginning of period | $ / shares $ 15.42
Granted | $ / shares
Exercised or vested | $ / shares 15.62
Forfeited or expired | $ / shares
Outstanding at end of period | $ / shares $ 14.83
Restricted Stock Units (RSUs) [Member]  
Shares  
Outstanding at beginning of period | shares 1.8
Granted | shares 0.8
Exercised or vested | shares (0.6)
Forfeited or expired | shares (0.2)
Outstanding at end of period | shares 1.8
Weighted-Average Grant-Date Fair Value  
Outstanding at beginning of period | $ / shares $ 16.54
Granted | $ / shares 19.92
Exercised or vested | $ / shares 18.48
Forfeited or expired | $ / shares 17.09
Outstanding at end of period | $ / shares $ 17.38
Performance Share Units [Member]  
Shares  
Outstanding at beginning of period | shares 0.6
Granted | shares 0.3
Exercised or vested | shares (0.2)
Forfeited or expired | shares (0.1)
Outstanding at end of period | shares 0.6
Weighted-Average Grant-Date Fair Value  
Outstanding at beginning of period | $ / shares $ 16.31
Granted | $ / shares 18.63
Exercised or vested | $ / shares 21.68
Forfeited or expired | $ / shares 20.36
Outstanding at end of period | $ / shares $ 15.70