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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Pre-tax stock-based compensation expense $ 7.1 $ 11.8 $ 19.1 $ 36.8
Deferred tax benefit $ 2.7 $ 4.5 $ 7.3 $ 14.0
Expected effective income tax rate     38.00% 38.00%
2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards authorized for grant (up to) (in shares) 11.3   11.3  
Number of shares available for grant 4.6   4.6  
Restricted stock | Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Restricted stock | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     1 year  
Performance share awards | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Stock options | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Award term     10 years  
Options, expiration period     12 months  
Year One | Stock options | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (as a percent)     33.33%  
Year Two | Stock options | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (as a percent)     33.33%  
Year Three | Stock options | 2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (as a percent)     33.33%