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Earnings per Common Share (Tables)
 9 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Calculations of Basic and Diluted Earnings (Loss) per Common Share
The calculations of basic and diluted earnings per common share for the three and nine months ended March 31, 2024 and 2023 were as follows: 
Three Months Ended
March 31,		Nine Months Ended
March 31,
(in millions, except per share data)2024202320242023
Net income $6.3 $18.6 $92.9 $18.0 
Dividends allocated to participating securities(0.1)(0.1)(0.2)(0.3)
Earnings available for common stockholders used in calculation of basic earnings per common share$6.2 $18.5 $92.7 $17.7 
Weighted average number of common shares outstanding, basic49.7 48.8 49.5 48.7 
Basic earnings per common share$0.12 $0.38 $1.87 $0.36 
Net income$6.3 $18.6 $92.9 $18.0 
Dividends allocated to participating securities(0.1)(0.1)(0.2)(0.3)
Earnings available for common stockholders used in calculation of diluted earnings per common share$6.2 $18.5 $92.7 $17.7 
Weighted average number of common shares outstanding, basic49.7 48.8 49.5 48.7 
Effect of shares issuable under share-based compensation plans0.6 0.4 0.6 0.3 
Weighted average number of common shares outstanding, diluted50.3 49.2 50.1 49.0 
Diluted earnings per common share$0.12 $0.38 $1.85 $0.36 
Schedule of Awards Issued Under Share-Based Compensation Plans Excluded From the Calculations of Diluted Earnings (Loss) per Share
The following awards issued under share-based compensation plans were excluded from the above calculations of diluted earnings per share because their effects were anti-dilutive:
Three Months Ended
March 31,		Nine Months Ended
March 31,
(in millions, except per share data)2024202320242023
Stock options— 0.6 — 1.7