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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 235.1	$ 140.4	$ 485.7	$ 349.9
Other comprehensive income (loss):
Foreign currency translation adjustments	67.2	(2.7)	90.8	(16.2)
Unrealized holding losses on financial investments	0.0	(0.5)	0.0	(1.0)
Post-retirement benefit obligations, net of income tax	0.0	0.0	0.0	0.2
Comprehensive income	302.3	137.2	576.5	332.9
Net income allocated to participating securities	(1.2)	(0.7)	(2.4)	(1.9)
Comprehensive income allocated to common stockholders, net of income tax	$ 301.1	$ 136.5	$ 574.1	$ 331.0

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