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Property and Equipment and Software and Content Development Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation	$ 14.1	$ 14.4	$ 19.2
Impairment charges against certain property and equipment assets		1.7
Capitalized software development costs, impairments	2.3		4.3
Software and content development costs, amortization	$ 36.8	$ 31.0	$ 31.7
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative

X

- Definition

Amount of expense for amortization of capitalized computer software costs.

+ References

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Amount of impairment loss from capitalized computer software costs.

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