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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 43.4    
Stock Options [Member]
     
Accelerated Vesting Conditions, Stock Options, Effective Period 1    
Accelerated Vesting Conditions, Stock Options, Employee Age 65    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 0.3    
Share-based Compensation Not Yet Recognized, Weighted Average Period 1    
Performance Based Restricted Stock Units [Member]
     
Performance-based stock units awarded 0.9 1.0 0.5
Shares entitled to recipients 3.0    
Percentage of units granted assumed 100.00%    
Percentage of units that are earned, minimum 0.00%    
Percentage of units that are earned, maximum 200.00%    
Performance-based stock, outstanding 1.8    
Restricted Stock Units (RSU) [Member]
     
Vesting period, years 3 years    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 43.1    
Share-based Compensation Not Yet Recognized, Weighted Average Period 2    
Minimum [Member] | Stock Options [Member]
     
Vesting period, years 3 years    
Minimum [Member] | Stock Price Based RSU [Member]
     
Vesting period, years 1 year    
Minimum [Member] | Restricted Stock Units (RSU) [Member]
     
Vesting period, years 1 year    
Maximum [Member] | Stock Options [Member]
     
Vesting period, years 5 years    
Maximum [Member] | Stock Price Based RSU [Member]
     
Vesting period, years 7 years    
Maximum [Member] | Restricted Stock Units (RSU) [Member]
     
Vesting period, years 3 years