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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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