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Equity and Redeemable Non-controlling Interest (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Stock Repurchased and Retired Share repurchases under our authorization were as follows:
 Repurchases Occurring in 2021Cumulative Repurchases as of December 31, 2021
 SharesAverage PriceSharesAverage Price
Share repurchase authorization756,883 $283.75 4,475,931 $117.80 
The following is a summary of our repurchases in the years ended December 31, 2021, 2020 and 2019:
Year Ended December 31,
202120202019
Shares repurchased pursuant to repurchase authorizations756,883 563,953 — 
Total purchase price (in millions)$214.8 $46.1 $— 
Average purchase price per share$283.75 $81.71 $— 
Shares repurchased in association with tax withholdings on the vesting of RSUs54,318 30,620 40,356 
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)
2019
First quarter$0.29 $6.7 
Second quarter0.30 7.0 
Third quarter0.30 7.0 
Fourth quarter0.30 6.9 
2020
First quarter$0.30 $7.0 
Second quarter0.30 6.8 
Third quarter0.31 7.1 
Fourth quarter0.31 8.2 
2021
First quarter$0.31 $8.3 
Second quarter0.35 9.3 
Third quarter0.35 10.6 
Fourth quarter0.35 10.6