XML 61 R49.htm IDEA: XBRL DOCUMENT v3.21.1
Share-Based Payments - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
Share-based compensation expense           $ 5.4 $ 4.0 $ 8.7 $ 9.4 $ 15.9
ParentCo                    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
Closing stock price (in dollars per share) $ 42.98 $ 43.10 $ 60.25 $ 44.20            
Key Employees | Restricted Stock Equivalents | ParentCo                    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
RSE awards granted, shares 120 134 73 100            
Vesting period, years 4 years     4 years            
Key Employees | Performance Shares                    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
Maximum award payout (in shares) 544 612 380              
Key Executives | Restricted Stock Equivalents | ParentCo                    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
RSE awards granted, shares 71 81 55              
Key Employees and Key Executives | Performance Shares                    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]                    
RSE awards granted, shares 272 306 190              
Vesting period, years 3 years 3 years 3 years 3 years 3 years