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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 29.9	$ 20.0	$ 3.1
Other comprehensive income / (loss)
Net change in foreign currency translation adjustment	(0.8)	3.8	0.6
Pension and post-retirement actuarial gains / (losses), net of $10.6, $4.8 and $0.9 of tax, respectively	31.6	(20.0)	(3.9)
Cash flow hedges, net of $0.0, $0.0 and $0.1 of tax, respectively	0.0	0.0	0.3
Other comprehensive income / (loss) net of tax	30.8	(16.2)	(3.0)
Total comprehensive income	$ 60.7	$ 3.8	$ 0.1

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