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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 250.6	$ 209.5
Other comprehensive income (loss), net of income tax:
Foreign currency translation adjustments	23.6	(13.5)
Unrealized holding losses on financial investments	0.0	(0.5)
Post-retirement benefit obligations	0.0	0.2
Comprehensive income	274.2	195.7
Net income allocated to participating securities	(1.2)	(1.2)
Comprehensive income allocated to common stockholders, net of income tax	$ 273.0	$ 194.5

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