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Stockholders’ Deficit - Stock repurchase program (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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)	11.1	8.1
Stock repurchased and retired during period, aggregate purchase price	$ 281.6	$ 176.5

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