Segment Information (Long-Lived Assets by Geographic Region) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 309.0	$ 295.7
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	159.7	139.2
Western Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	134.7	142.9
Rest of the World
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 14.6	$ 13.6