XML 51 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
ParentCo            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Closing stock price (in dollars per share) $ 60.25 $ 44.20 $ 43.84 $ 37.34    
Selling, General and Administrative Expenses            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Share-based compensation cost         $ 6.5 $ 6.7
Key Employees | Restricted Stock Equivalents | ParentCo            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
RSE awards granted, shares 73 100 92 106    
Vesting period, years   4 years 4 years 4 years    
Key Employees | Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
Maximum award payout (in shares) 380 476 498      
Key Executives | Restricted Stock Equivalents | ParentCo            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
RSE awards granted, shares 55 68 73      
Key Employees and Key Executives | Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]            
RSE awards granted, shares 190 238 249      
Vesting period, years   3 years 3 years