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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets    
Deferred compensation $ 13.7 $ 15.9
State loss carryforwards 13.8 14.7
Foreign loss carryforwards 17.7 19.8
Federal carryforwards 3.4 0.0
Tax benefit of uncertain tax positions 9.4 10.0
Deferred income 4.6 0.0
Lease liabilities 2.4 4.8
Foreign tax credits 16.3 16.0
Other 0.0 0.3
Total deferred tax assets 81.3 81.5
Valuation allowance (44.8) (47.6)
Deferred tax assets, net of valuation allowance 36.5 33.9
Deferred Tax Liabilities    
Intangible asset amortization (353.0) (295.8)
Non-deductible intangible amortization (101.4) (97.0)
Junior convertible securities interest (92.6) (83.1)
Right-of-use assets (1.9) (3.7)
Accrued expenses (4.1) (2.0)
Deferred income 0.0 (10.4)
Other (2.0) (2.9)
Total deferred tax liabilities (555.0) (494.9)
Deferred tax liability (net) (518.5) (461.0)
Carryforwards valuation allowance $ 15.7 $ 17.0