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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jul. 31, 2023	Feb. 28, 2022
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,200.0	$ 1,200.0
Class A
Class of Stock [Line Items]
Stock repurchased and retired during period (in shares)	14.6	3.8	37.0	18.8
Stock repurchased and retired during period, aggregate purchase price	$ 351.8	$ 104.4	$ 895.6	$ 436.1

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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