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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 26.9	$ 29.9	$ 20.0
Other comprehensive (loss) / income
Net change in foreign currency translation adjustment	(13.2)	(0.8)	3.8
Pension and post-retirement actuarial gains / (losses), net of $3.1, $10.6 and $4.8 of tax, respectively	8.8	31.6	(20.0)
Other comprehensive (loss) / income net of tax	(4.4)	30.8	(16.2)
Total comprehensive income	$ 22.5	$ 60.7	$ 3.8

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