Basis of Presentation and Principles of Consolidation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2025	May 15, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Class A Common Stock, par value (in dollars per share)		$ 0.001
Change in the number of authorized common shares		3,000,000,000
Class A Common Stock, shares authorized		5,000,000,000
Total equity	$ 11,589.6		$ 10,363.1	$ 9,847.4	$ 9,030.6	$ 8,733.7	$ 8,395.8
Common stock	1.2			1.2
Additional paid-in capital	3,957.7			3,601.8
Common Stock
Total equity	1.2		1.2	1.2	1.2	1.2	1.2
Additional Paid in Capital
Total equity	$ 3,957.7		$ 3,672.2	$ 3,601.8	$ 3,349.2	$ 3,223.5	$ 3,100.6