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Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (323.9)	$ (322.2)
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(322.6)	(322.0)
Unrealized losses on defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (1.3)	$ (0.2)

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