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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Computations of basic and diluted loss per share for loss from continuing operations
The computations of basic and diluted earnings per share were as follows (in millions, except per share data):

 For the Three Months Ended June 30,For the Six Months Ended June 30,
 2024202320242023
Net income $245.9 $217.2 $370.2 $315.2 
Weighted-average shares outstanding – basic35.6 35.5 35.6 35.5 
Add: Potential effect of dilutive securities attributable to stock-based payments0.2 0.1 0.2 0.1 
Weighted-average shares outstanding – diluted35.8 35.6 35.8 35.6 
Earnings per share – Basic:$6.91 $6.12 $10.40 $8.88 
Earnings per share – Diluted:$6.87 $6.10 $10.34 $8.85 
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation
The following stock appreciation rights and restricted stock units were outstanding but not included in the diluted earnings per share calculation as the assumed exercise of such rights would have been anti-dilutive (in millions, except for per share data):

 For the Three Months Ended June 30,For the Six Months Ended June 30,
 2024202320242023
Weighted-average number of shares— 0.2 — 0.2