Segment Information - Revenue and Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from external customers and Long-lived assets, net
Revenues	$ 30,455.2	$ 29,527.4	$ 27,814.8
Long-lived assets, net	4,943.0	4,603.2
U.S.
Revenue from external customers and Long-lived assets, net
Revenues	17,715.1	17,186.5	16,801.7
Long-lived assets, net	3,529.0	3,255.4
U.K.
Revenue from external customers and Long-lived assets, net
Revenues	9,322.0	9,240.4	8,443.4
Long-lived assets, net	975.5	953.6
Other International
Revenue from external customers and Long-lived assets, net
Revenues	3,418.1	3,100.5	$ 2,569.7
Long-lived assets, net	$ 438.5	$ 394.2