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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of share-based compensation expenses
Total share-based compensation expenses were as follows (in millions):
Three months ended September 30,Nine months ended September 30,
2024202320242023
Option awards$2.2 $2.0 $9.8 $9.7 
Other share-based awards 5.6 7.9 18.5 24.7 
Total share-based compensation before tax 7.8 9.9 28.3 34.4 
Tax benefit 1.9 2.4 6.9 8.2 
Total share-based compensation expense included in net income$5.9 $7.5 $21.4 $26.2