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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets    
Deferred compensation $ 15.9 $ 14.6
State loss carryforwards 14.7 16.4
Foreign loss carryforwards 19.8 20.0
Tax benefit of uncertain tax positions 10.0 12.6
Lease liabilities 4.8 6.6
Foreign tax credits 16.0 15.4
Other 0.3 0.3
Total deferred tax assets 81.5 85.9
Valuation allowance (47.6) (48.1)
Deferred tax assets, net of valuation allowance 33.9 37.8
Deferred Tax Liabilities    
Intangible asset amortization (295.8) (280.9)
Non-deductible intangible amortization (97.0) (109.8)
Junior convertible securities interest (83.1) (72.4)
Right-of-use assets (3.7) (5.1)
Accrued expenses (2.0) (3.0)
Deferred income (10.4) (23.4)
Other (2.9) (4.4)
Total deferred tax liabilities (494.9) (499.0)
Deferred income tax liability (net) (461.0) (461.2)
Other Assets    
Deferred Tax Assets    
Foreign loss carryforwards 19.8 20.0
Deferred Tax Liabilities    
Carryforwards valuation allowance $ 17.0 $ 16.5