XML 78 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants under the PPG Omnibus Plan 7,300,000   7,300,000  
Stock-based compensation expense $ 3.0 $ 9.0 $ 21.0 $ 26.0
Total income tax benefit recognized related to the stock-based compensation 1.0 $ 4.0 $ 5.0 $ 9.0
Stock options granted from the PPG Omnibus Plan     532,705 590,058
Stock options granted from the PPG Omnibus Plan, weighted average fair value per share (in usd per share)     $ 25.27 $ 21.15
Maximum term of the outstanding stock options for the PPG Omnibus Plan and the PPG Stock Plan for certain employees     10 years  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 6.3      
RSUs granted     249,062 215,749
RSUs granted, weighted average fair value per share (in usd per share)     $ 107.23 $ 96.69
Award vesting period (in years)     3 years  
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted     52,450 57,817
RSUs granted, weighted average fair value per share (in usd per share)     $ 115.64 $ 103.67
Executive Officer Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for recognizing compensation costs (in years)     3 years  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable period     36 months