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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, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
shares
Dec. 31, 2016
shares
Jun. 30, 2016
USD ($)
shares
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Allocated Share-based Compensation Expense | $ $ 0.4     $ 2.0 $ 5.1   $ 5.6
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ $ 8.7         $ 8.7  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 165,186     257,811   208,868 925,296
Phantom Share Units (PSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   12,145 187,115        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share | $ / shares $ 11.68         $ 11.68  
Share-based compensation liability | $ $ 2.2         $ 2.2  
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           263,410  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           234,895  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           3 years  
Share-based compensation, units awarded but not yet granted 219,866         219,866  
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   165,999 177,861        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   3,334       350,295  
Minimum [Member] | Performance Shares [Member]              
Performance Factor           0  
Maximum [Member] | Performance Shares [Member]              
Performance Factor           2  
Share-based Compensation Award, Tranche One [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   19,012 59,285        
Performance Factor           1.021  
Share-based Compensation Award, Tranche Two [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     73,826        
Performance Factor           2  
Share-based Compensation Award, Tranche Three [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     68,556        
Performance Factor           0