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Common Equity (Tables)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Calculation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2024 and 2023, respectively.
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions, except per share data)2024202320242023
Numerator:
Net income available to common shareholders$30.6 $35.6 $84.4 $211.1 
Denominator:
Weighted average common shares outstanding175.2 176.9 175.6 177.7 
Dilutive effect of share-based awards and options outstanding0.7 0.9 0.5 0.8 
Weighted average diluted common shares outstanding (1)
175.9 177.7 176.1 178.5 
Basic earnings per common share$0.17 $0.20 $0.48 $1.19 
Diluted earnings per common share0.17 0.20 0.48 1.18 
(1)Weighted average diluted common shares outstanding may not sum due to rounding.
Schedule of Common Shares Outstanding Roll Forward
The following table shows changes to our Class B common shares outstanding for the three and nine months ended September 30, 2024 and 2023.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Outstanding at beginning of period92,301,573 94,064,251 92,931,242 94,993,144 
Repurchases of common stock(145,896)(497,435)(1,289,769)(1,869,474)
Share issuances— 219 698,133 681,642 
Exercise of employee stock options— — 71,529 6,000 
Shares withheld for employee taxes— — (255,458)(244,277)
Outstanding at end of period92,155,677 93,567,035 92,155,677 93,567,035