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Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Schedule of Stock Repurchased and Retired
Share repurchases under our authorization were as follows:
 Repurchases Occurring in 2023Cumulative Repurchases as of December 31, 2023
 SharesAverage PriceSharesAverage Price
Share repurchase authorization142,729 $240.81 7,047,510 $174.96 
The following is a summary of our repurchases in the years ended December 31, 2023, 2022 and 2021:

Year Ended December 31,
202320222021
Shares repurchased pursuant to repurchase authorizations142,729 2,428,850 756,883 
Total purchase price ($ in millions)$34.4 $671.4 $214.8 
Average purchase price per share$240.81 $276.42 $283.75 
Shares repurchased in association with tax withholdings on the vesting of RSUs70,692 56,911 54,318 
Schedule of Dividends Declared
We declared and paid dividends on our common stock as follows:
Quarter declaredDividend amount per share
Total amount of dividends paid
($ in millions)
2021
First quarter$0.31 $8.2 
Second quarter0.35 9.3 
Third quarter0.35 10.6 
Fourth quarter0.35 10.6 
2022
First quarter$0.35 $10.3 
Second quarter0.42 11.9 
Third quarter0.42 11.6 
Fourth quarter0.42 11.4 
2023
First quarter$0.42 $11.5 
Second quarter0.50 13.8 
Third quarter0.50 13.8 
Fourth quarter0.50 13.7