XML 55 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Allocated Share-based Compensation Expense | $ $ 1.7 $ 2.4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 9.2  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 165,467 70,996
Phantom Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares $ 9.10  
Share-based compensation liability | $ $ 0.6  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 181,065 146,061
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 332,875  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based compensation, units awarded but not yet granted 279,024  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 143,809  
Minimum [Member] | Performance Shares [Member]    
Performance Factor 0  
Maximum [Member] | Performance Shares [Member]    
Performance Factor 2