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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 23.1	$ 24.6	$ 60.3	$ 49.2
Other comprehensive income:
Foreign currency translation	(0.2)	0.3	0.0	0.1
Total comprehensive income	$ 22.9	$ 24.9	$ 60.3	$ 49.3

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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