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Stockholders’ Deficit - Stock repurchase program (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 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)	11.3	6.9	22.4	15.0
Stock repurchased and retired during period, aggregate purchase price	$ 262.2	$ 155.2	$ 543.8	$ 331.7

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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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