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Compensation Plans - Others (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
item
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
May 01, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation expense recognized | $ $ 23.0 $ 26.0 $ 22.0  
Deferred compensation cost | $ $ 14.0 $ 19.0    
Total unrecognized compensation cost, period of recognition 3 years      
Number of impacted participants on spin off | item 133      
Business days, period 5 days      
Common Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 10 years      
Shares under Options (in shares) 1,300,000 1,700,000    
Currently Exercisable - Shares Under Options (in shares) 1,200,000 1,400,000    
Proceeds received from options exercised | $ $ 4.0 $ 28.0 $ 5.0  
Restricted Stock and Performance Restricted Stock Units        
Restricted Stock and Performance Restricted Stock Units        
Shares withheld to offset tax withholding obligations (in shares) 237,000 200,000 323,000  
Unvested restricted stock and performance restricted stock units activity        
Weighted-average remaining vesting period of restricted stock and restricted stock units 1 year      
Total fair values (at vesting) of restricted stock and restricted stock units vested | $ $ 24.0 $ 21.0 $ 24.0  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 3 years      
Unvested restricted stock and performance restricted stock units activity        
Unvested at the beginning of the period (in shares) 36,000      
Vested (in shares) (36,000)      
Unvested at the end of the period (in shares)   36,000    
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 41.77      
Vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 41.77      
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares   $ 41.77    
Restricted Stock Units        
Unvested restricted stock and performance restricted stock units activity        
Unvested at the beginning of the period (in shares) 867,000      
Granted (in shares) 790,000      
Vested (in shares) (528,000)      
Forfeited (in shares) (167,000)      
Unvested at the end of the period (in shares) 962,000 867,000    
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 43.34      
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 34.86      
Vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 42.07      
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 41.48      
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 37.39 $ 43.34    
Minimum | Common Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 3 years      
Minimum | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 1 year      
Unvested restricted stock and performance restricted stock units activity        
Percentage of performance metrics during performance period 0.00%      
Maximum | Common Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 5 years      
Maximum | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information        
Stock-based awards, vesting period 4 years      
Unvested restricted stock and performance restricted stock units activity        
Percentage of performance metrics during performance period 200.00%      
Former Chairman, Chief Executive Officer and President        
Share-based Compensation Arrangement by Share-based Payment Award        
Total share-based compensation expense recognized | $ $ 7.0      
2006 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Maximum number of shares available for future awards (in shares)       0
2014 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Maximum number of shares reserved for awards (in shares)       33,000,000
Maximum number of shares available for future awards (in shares) 31,000,000      
Maximum number of shares available for future awards to be issued as restricted stock and performance restricted stock unit 21,000,000