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Stockholders’ Deficit - Stock repurchase program (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Aug. 31, 2025 | Dec. 31, 2024 | Jul. 31, 2023 | Feb. 28, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 1,200.0
Stock repurchase program, additional authorized amount |  |  |  |  | $ 1,500.0 | $ 1,200.0 | $ 1,200.0 |
Stock repurchased and retired during period, aggregate purchase price | $ 393.3 | $ 351.8 | $ 1,300.3 | $ 895.6 |  |  |  |
Class A |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchased and retired during period (in shares) | 13.8 | 14.6 | 46.0 | 37.0 |  |  |  |
Stock repurchased and retired during period, aggregate purchase price | $ 393.3 | $ 351.8 | $ 1,300.3 | $ 895.6 |  |  |  |

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