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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Schedule Of Capital Stock
Changes to the number of shares of capital stock outstanding were as follows:
 Common stock
outstanding		Exchangeable
shares outstanding
 Class AClass BClass AClass B
 (Share amounts in millions)
Balance as of December 31, 20212.6 200.6 2.7 11.1 
Shares issued under equity compensation plans— 0.3 — — 
Purchase of treasury shares— (1.0)— — 
Shares exchanged for common stock— 0.1 — (0.1)
Balance as of December 31, 20222.6 200.0 2.7 11.0 
Shares issued under equity compensation plans— 0.4 — — 
Purchase of treasury shares— (3.4)— — 
Shares exchanged for common stock— 1.6 — (1.6)
Balance as of December 31, 20232.6 198.6 2.7 9.4 
Shares issued under equity compensation plans— 0.8 — — 
Purchase of treasury shares— (10.9)— — 
Shares exchanged for common stock— 2.2 — (2.2)
Balance as of December 31, 20242.6 190.7 2.7 7.2 
Schedule Of Class of Treasury Stock
The following table presents the shares repurchased and aggregate cost, including brokerage commissions and excise taxes incurred, under the current and superseded share repurchase programs for the years ended December 31, 2024, 2023 and 2022.
For the years ended
December 31, 2024December 31, 2023December 31, 2022
Shares repurchased10,907,779 3,454,694995,000
Aggregate cost (in millions)$645.2 $212.7 $51.5