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Stockholders’ Deficit - Stock repurchase program (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	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			$ 1,200.0	$ 1,200.0
Stock repurchased and retired during period, aggregate purchase price	$ 504.0	$ 281.6
Class A
Class of Stock [Line Items]
Stock repurchased and retired during period (in shares)	18.1	11.1
Stock repurchased and retired during period, aggregate purchase price	$ 504.1	$ 281.6

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