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Stock-Based Compensation (Restricted Stock Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 02, 2019
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested, shares, beginning balance 1,028,532      
Nonvested, weighted-average grant date fair value, beginning balance (in dollars per share) $ 46.69      
Granted, shares [1] 1,246,040      
Granted, weighted-average grant date fair value (in dollars per share) $ 35.51 [1] $ 49.16 $ 43.66  
Vested, shares (255,243)      
Vested, weighted-average grant date fair value (in dollars per share) $ 35.28      
Forfeited, shares (358,126)      
Forfeited, weighted-average grant date fair value (in dollars per share) $ 41.80      
Nonvested, shares, ending balance 1,661,203 1,028,532    
Nonvested, weighted-average grant date fair value, ending balance (in dollars per share) $ 40.56 $ 46.69    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Total fair value of RSU's vested $ 9.0 $ 7.3 $ 2.3  
Granted, weighted-average grant date fair value (in dollars per share) $ 35.51 [1] $ 49.16 $ 43.66  
Director [Member] | Restricted Stock Units (RSUs) [Member] | Non-Employee Director Equity Plan 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted stock units granted to each non-employee director       6,934
Employee [Member] | Employee Equity and Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Measurement Period Performance-Based Restricted Stock Units 1 year      
Employee [Member] | Restricted Stock Units (RSUs) [Member] | Employee Equity and Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted, shares 1,200,000      
Employee [Member] | Time-based Restricted Stock Units [Member] | Employee Equity and Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 4 years      
Employee [Member] | Performance-based Restricted Stock Units Graded Vesting [Member] | Employee Equity and Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 4 years      
Employee [Member] | Performance-based Restricted Stock Units Cliff Vesting [Member] | Employee Equity and Incentive Plan 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Measurement Period Additional Performance Metric Selected Performance-Based Restricted Stock Units 3 years      
[1]
The RSUs granted during 2019 are primarily related to our employee annual equity award grant in March 2019 and non-employee director annual equity award grant in January 2019.