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Stock-Based Employee Compensation - Market-Based Stock Units (Narrative) (Details) - Market-Based Stock Units
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended
Jun. 15, 2016
Jun. 15, 2015
Jun. 15, 2014
Jun. 30, 2016
Installment
shares
Jun. 28, 2015
Installment
shares
Jun. 29, 2014
Installment
shares
Jan. 01, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)       0.3 0.2 0.5  
Award vesting period       2 years 2 years 2 years  
Number of installments | Installment       2 2 2  
Expected term (in years) 1 year 9 months 18 days 1 year 9 months 18 days 1 year 9 months 18 days        
Units outstanding (in shares)             0.8
Equity instruments other than options, vested and expected to vest, outstanding (in shares)             0.7
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term             1 year 1 month 20 days
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value | $             $ 15.7
Compensation cost not yet recognized | $             $ 8.4
Compensation cost not yet recognized, period for recognition             1 year 2 months 16 days