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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 04, 2020
May 31, 2014
Jun. 30, 2014
Jun. 30, 2020
Jun. 30, 2019
Aug. 04, 2020
Share-based Compensation, Aggregate Disclosures:            
Maximum number of shares per participant, 12 month period (in shares)   1,000,000.0 2,500,000      
Extension of plan term     10 years      
Unrecognized compensation costs related to nonvested awards       $ 11.7    
Unrecognized compensation costs related to nonvested awards, weighted average period for recognition       1 year 1 month 6 days    
Shares available for issuance under the Plan (in shares)       1,100,000    
Stock options granted (in shares)       249,900 302,700  
Options, Additional Disclosures:            
Options exercised, aggregate intrinsic value       $ 1.2    
Performance Shares            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares) 79,070          
Restricted Stock Units (RSUs) & Stock Options            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares) 73,636          
Restricted Stock Units (RSUs)            
Share-based Compensation, Aggregate Disclosures:            
Share grants in period (in shares) 907     153,600 195,200  
Stock Options            
Share-based Compensation, Aggregate Disclosures:            
Stock options granted (in shares) 249,875          
Stock options granted, exercise price (in USD per share) $ 39.98          
Long-term Equity Incentive Plan, 2005            
Share-based Compensation, Aggregate Disclosures:            
Number of shares authorized for grant under 2005 Long-Term Equity Incentive Plans (in shares)   5,000,000.0        
Number of additional shares authorized (in shares)     1,800,000      
Long-term Incentive Plan, 2020 | Subsequent Event            
Share-based Compensation, Aggregate Disclosures:            
Common Stock, Capital Shares Reserved for Future Issuance           2,827,210
Number of new shares for future issuance under 2020 Long-Term Incentive Plans (in shares)           2,000,000
Number of unissued shares reserved for 2020 Long-Term Incentive Plans (in shares)           827,210