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Stock Compensation - Award Activity (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Stock Options [Member]    
Shares    
Outstanding at beginning of period 1.9  
Granted  
Exercised or vested (0.1)  
Forfeited or expired  
Outstanding at end of period 1.8  
Weighted- Average Exercise Price    
Outstanding at beginning of period $ 14.46  
Granted  
Exercised or vested $ 13.83  
Forfeited or expired  
Outstanding at end of period $ 14.50  
Stock Appreciation Rights (SARs) [Member]    
Shares    
Outstanding at beginning of period 0.4  
Granted  
Exercised or vested (0.1)  
Forfeited or expired  
Outstanding at end of period 0.3  
Weighted- Average Exercise Price    
Outstanding at beginning of period $ 15.18  
Granted  
Exercised or vested $ 12.53  
Forfeited or expired  
Outstanding at end of period $ 15.46  
Weighted-Average Grant-Date Fair Value    
Granted   $ 7.45
Restricted Stock Units (RSUs) [Member]    
Shares    
Outstanding at beginning of period 1.5  
Granted 0.7  
Exercised or vested (0.7)  
Forfeited or expired (0.2)  
Outstanding at end of period 1.3  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of period $ 18.18  
Granted 21.68  
Exercised or vested 17.21  
Forfeited or expired 20.46  
Outstanding at end of period $ 20.09  
Performance Share Units [Member]    
Shares    
Outstanding at beginning of period 0.3  
Granted 0.4  
Exercised or vested (0.1)  
Forfeited or expired (0.2)  
Outstanding at end of period 0.4  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of period $ 24.36  
Granted 22.97  
Exercised or vested 24.48  
Forfeited or expired 24.57  
Outstanding at end of period $ 22.92