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Stock-Based Compensation Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Employee Stock Option [Member]    
[Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 4.2  
Unrecognized compensation expense, Expected weighted average period for recognition (years) 1 year 10 months  
Restricted Stock Units (RSUs) [Member]    
[Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 30.2  
Unrecognized compensation expense, Expected weighted average period for recognition (years) 1 year 11 months  
Phantom Share Units (PSUs) [Member]    
[Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3.9  
Unrecognized compensation expense, Expected weighted average period for recognition (years) 2 years  
Deferred Compensation Share-based Arrangements, Liability, Current $ 0.7 $ 1.0
Employee Stock Purchase Plan [Member]    
[Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 355,000  
Stock Incentive Plan [Member]    
[Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 10,473,956  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 4,647,815  
Reduction in stock options available for issue 1  
Authorized share reserve reduction in awards other than stock options or share appreciation rights available for issue, conversion ratio 1.7