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Stock-Based Compensation (Details) - Equity and Incentive Plan, 2017 [Member]
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
shares
Jun. 30, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares authorized 5.5 5.5
Measurement period, performance-based restricted stock units 1 year  
Number of restricted stock units granted   0.6
Time-based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Performance-based Restricted Stock Units Graded Vesting [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Performance-based Restricted Stock Units Cliff Vesting [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Measurement period for additional performance metrics 3 years