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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Stock Repurchased and Retired Share repurchases under our authorization were as follows:
 Repurchases Occurring in 2020Cumulative Repurchases as of December 31, 2020
 SharesAverage PriceSharesAverage Price
Share repurchase authorization563,953 $81.71 3,719,048 $84.02 
The following is a summary of our repurchases in the years ended December 31, 2020, 2019 and 2018:
Year Ended December 31,
202020192018
Shares repurchased pursuant to repurchase authorizations563,953 — 2,112,370 
Total purchase price (in millions)$46.1 $— $179.0 
Average purchase price per share$81.71 $— $84.72 
Shares repurchased in association with tax withholdings on the vesting of RSUs30,620 40,356 30,119 
Schedule of Dividends Declared
We declared and paid dividends on our Class A and Class B Common Stock as follows:
Quarter declaredDividend amount per Class A and Class B share

Total amount of dividends paid
(in millions)
2018
First quarter$0.27 $6.7 
Second quarter0.29 7.2 
Third quarter0.29 7.0 
Fourth quarter0.29 6.8 
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