Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,100.0	$ 764.9	$ 761.4
Other comprehensive income (loss):
Foreign currency translation adjustments	78.3	(43.0)	24.6
Unrealized holding gains (losses) on financial investments	0.0	5.0	(2.8)
Post-retirement benefit obligations, net of income tax	0.2	0.3	(0.2)
Realized gains on available-for-sale financial investments	0.0	(1.3)	0.0
Comprehensive income	1,178.5	725.9	783.0
Net income allocated to participating securities	(5.2)	(3.9)	(3.9)
Comprehensive income allocated to common stockholders, net of income tax	$ 1,173.3	$ 722.0	$ 779.1