Segment Information - Property and Equipment, Net by Location (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 1,455.8	$ 1,424.4
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	1,365.5	1,348.1
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	75.7	60.9
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	14.6	15.4
Total long-lived assets outside of the United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 90.3	$ 76.3