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Segment Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting [Abstract]      
Adjusted EBITDA $ 38.8 $ 63.1 $ 63.4
Share-based compensation charges (2.8) (2.5) (2.8)
Depreciation and amortization (12.7) (13.6) (15.6)
Restructuring charges (6.4) (1.9) (6.2)
Impairment charges (12.7) 0.0 0.0
Acquisition and disposal costs 0.0 (0.3) (1.5)
Other charges 0.0 0.0 (1.1)
Defined benefits pension (charge) / credit (7.6) 0.1 2.3
Interest expense, net (6.3) (3.9) (3.1)
Credit / (provision) for income taxes 7.1 (9.0) (5.4)
Net (loss) / income from continuing operations $ (2.6) $ 32.0 $ 30.0