XML 87 R54.htm IDEA: XBRL DOCUMENT v3.24.0.1
Property and Equipment and Software and Content Development Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Abstract]      
Depreciation $ 13.0 $ 14.1 $ 14.4
Impairment charges against certain property and equipment assets 1.1   1.7
Capitalized software development costs, impairments   2.3  
Software and content development costs, amortization $ 42.8 $ 36.8 $ 31.0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]     General and administrative