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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Reserves and accrued expenses $ 187.6 $ 169.6
Net operating loss carryforwards 154.6 111.2
R&D credits 26.3 4.1
Interest expense limitation carryforwards 63.0 9.9
Valuation allowance (38.0) (36.3)
Lease liability 65.0 64.0
Total deferred tax assets 458.5 322.5
Deferred tax liabilities:    
Reserves and accrued expenses 23.8 15.5
Amortizable intangible assets 1,803.3 1,229.9
Plant and equipment 8.8 10.8
Accrued tax on unremitted foreign earnings 18.6 17.1
ROU asset 62.5 61.7
Total deferred tax liabilities $ 1,917.0 $ 1,335.0