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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30,Six months ended June 30,
2024202320242023
Option awards$2.3 $1.9 $7.6 $7.7 
Other share-based awards 7.9 10.6 12.9 16.8 
Total share-based compensation before tax 10.2 12.5 20.5 24.5 
Tax benefit 2.5 3.0 5.0 5.8 
Total share-based compensation expense included in net income$7.7 $9.5 $15.5 $18.7