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Stock-Based Compensation (Narrative) (Details)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   0.7 1.2  
Share-based Compensation Arrangement by Share-based Payment Award, Shares to be Repurchased Next Year 0.4      
Stock-based compensation expense | $   $ 63.9 $ 29.2 $ 29.9
Stock Options [Member]        
Accelerated Vesting Conditions, Stock Options, Effective Period   1    
Accelerated Vesting Conditions, Stock Options, Employee Age   65    
2003 Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   0.4    
Performance Based Restricted Stock Units [Member]        
Percentage of units that are earned, minimum   0.00%    
Percentage of units that are earned, maximum   200.00%    
Performance-based stock units awarded   1.1 0.7 0.7
Shares entitled to recipients   3.0    
Percentage of units granted assumed   100.00%    
Performance-based stock, outstanding   2.1    
Restricted Stock Units (RSU) [Member]        
Vesting period, years   3 years    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $   $ 119.1    
Share-based Compensation Not Yet Recognized, Weighted Average Period   2 years    
2010 Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   0.3    
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 Price Based RSU [Member]        
Vesting period, years   7 years    
Maximum [Member] | Restricted Stock Units (RSU) [Member]        
Vesting period, years   3 years