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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Comprehensive Income
Net income	$ 529.0	$ 468.2	$ 370.8
Other comprehensive income (loss), net of income tax:
Foreign currency translation adjustments	(19.3)	36.5	26.1
Unrealized holding losses on financial investments		(0.3)
Post-retirement benefit obligations	(0.1)	1.2
Comprehensive income	509.6	505.6	396.9
Comprehensive loss attributable to redeemable noncontrolling interest			4.1
Comprehensive income excluding redeemable noncontrolling interest	509.6	505.6	401.0
Change in redemption value of redeemable noncontrolling interest			(0.5)
Comprehensive income allocated to participating securities	(1.7)	(1.2)	(1.7)
Comprehensive income allocated to common stockholders, net of income tax	$ 507.9	$ 504.4	$ 398.8

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