Summary of Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (324.0)	$ (297.3)
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	(320.0)	(292.8)
Unrealized losses on defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total	$ (4.0)	$ (4.5)