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Stock-based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
shares
Mar. 31, 2019
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
shares
Share-based Payment Arrangement, Expense | $ $ 1.4 $ 1.2   $ 4.2 $ 5.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $   $ 7.7     $ 7.7
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 202,245 213,599   167,775 245,033
Phantom Share Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares $ 9.82     $ 9.82  
Share-based compensation liability | $ $ 1.3     $ 1.3  
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   264,936     264,936
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 0     259,107  
Minimum [Member] | Performance Shares [Member]          
Performance Factor     0    
Maximum [Member] | Performance Shares [Member]          
Performance Factor     2