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Stock-Based Compensation (Details) - Equity and Incentive Plan, 2017 [Member]
shares in Millions
9 Months Ended
Sep. 30, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum number of shares authorized 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