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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Stock Settled Stock Appreciation Rights SARS [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 0.3 $ 0.7 $ 0.6 $ 1.4
Unrecognized compensation expense 0.2   0.2  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 1.5 1.5 2.7 2.8
Unrecognized compensation expense 8.2   $ 8.2  
Weighted-average period over which remaining compensation expense will be recognized (in years)     2 years  
Performance Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 1.0 $ 0.6 $ 2.1 $ 1.1
Unrecognized compensation expense $ 6.5   $ 6.5  
Weighted-average period over which remaining compensation expense will be recognized (in years)     2 years