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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Stock-based compensation expense $ 7.8 $ 7.1
Accrued liabilities 33.5 27.5
Deferred revenue 6.7 8.5
Net operating loss carryforwards - Non-U.S. 18.9 18.1
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs 102.7 69.2
Allowance for doubtful accounts 2.4 1.8
Lease liabilities 35.9 35.0
Other 0.0 0.1
Total deferred tax assets 220.8 184.0
Deferred tax liabilities:    
Acquired intangible assets (68.5) (73.2)
Property, equipment and capitalized software (39.6) (39.2)
Deferred Tax Liabilities, Leasing Arrangements (31.4) (30.2)
Unrealized exchange gains, net (1.7) (1.0)
Prepaid expenses (19.3) (19.2)
Investments in unconsolidated entities (11.4) (14.6)
Withholding tax - foreign dividends (7.1) (1.3)
Total deferred tax liabilities (179.0) (178.7)
Net deferred tax liability before valuation allowance 41.8 5.3
Valuation allowance 26.2 26.3
Deferred Tax Assets, Net 15.6  
Total deferred tax liabilities   21.0
Deferred Tax Assets, Capital Loss Carryforwards 12.9 $ 16.7
Foreign tax credits included in Valuation Allowance $ 9.7