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Stock-Based Compensation Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
shares
Employee Stock Option [Member]  
[Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5.1
Unrecognized compensation expense, Expected weighted average period for recognition (years) 2 years
Restricted Stock Units (RSUs) [Member]  
[Line Items]  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 35.5
Unrecognized compensation expense, Expected weighted average period for recognition (years) 2 years 1 month
Phantom Share Units (PSUs) [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) 2 years 5 months
Deferred Compensation Share-based Arrangements, Liability, Current $ 0.2
Employee Stock Purchase Plan [Member]  
[Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 365,000
Stock Incentive Plan [Member]  
[Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 7,473,956
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 1,608,588
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