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Earnings Per Share Attributable to Common Stockholders
 6 Months Ended
Jun. 30, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Attributable to Common Stockholders
Note 8. Earnings Per Share Available to Common Stockholders
Three months ended
June 30,		Six months ended
June 30,
2025202420252024
Net income available to common stockholders$99.5 $100.7 $202.4 $197.8 
Basic weighted average shares outstanding185,365,576183,887,145185,096,464183,473,233
Weighted average effect of dilutive securities:
Share units712,803434,999816,395630,431
Stock options and employee share purchase plan570,753590,440589,689643,154
Diluted weighted average shares outstanding186,649,132184,912,584186,502,548 184,746,818 
Earnings per share available to common stockholders:
Basic$0.54 $0.55 $1.09 $1.08 
Diluted$0.53 $0.54 $1.09 $1.07