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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
Schedule of Income Before the Provision for Income Taxes from Continuing Domestic and Foreign Operations
The following table presents income before the provision for income taxes from continuing domestic and foreign operations.
Year Ended December 31,
(in millions)202220212020
Domestic$218.0 $101.4 $106.7 
Foreign(4.1)— — 
Income before provision for income taxes$213.9 $101.4 $106.7 
Components of the Provision for (Benefit from) Income Taxes for Continuing Operations
The following table presents the components of the provision for (benefit from) income taxes for continuing operations.
Year Ended December 31,
(in millions)202220212020
Current:
Federal$17.1 $— $— 
State20.3 6.3 10.1 
Total current taxes37.4 6.3 10.1 
Deferred:
Federal27.5 5.9 (287.5)
State(5.5)(0.4)(23.2)
Total deferred taxes22.0 5.5 (310.7)
Provision for (benefit from) income taxes$59.4 $11.8 $(300.6)
Provision for (benefit from) income taxes on earnings subject to income taxes differs from statutory federal rate
The provision for (benefit from) income taxes on earnings subject to income taxes differs from the statutory federal rate due to the following:
Year Ended December 31,
(in millions)202220212020
Federal income taxes at 21%
$44.9 $21.3 $22.4 
State income tax, net of federal benefit11.8 6.2 5.5 
Branded prescription drug fee6.5 4.8 4.9 
Loss on extinguishment of convertible senior notes12.0 — — 
Stock-based compensation expense(2.5)(11.3)(6.7)
Officer compensation9.2 7.0 3.7 
Change in tax rate(1.3)0.2 3.3 
Expired tax attributes— 0.6 1.1 
Research credits(29.9)(22.0)(39.0)
Change in valuation allowance7.4 5.0 (296.3)
Other1.3 — 0.5 
Provision for (benefit from) income taxes$59.4 $11.8 $(300.6)
Components of deferred tax assets
The following table presents the significant components of our deferred tax assets.
 December 31,
(in millions)20222021
Deferred tax assets:
Net operating losses$27.4 $90.3 
Research and development credits108.9 129.7 
Capitalized research and development91.1 17.9 
Stock-based compensation expense45.9 38.9 
Operating lease assets26.8 29.3 
Intangible assets80.7 86.1 
Other24.9 21.6 
Total deferred tax assets405.7 413.8 
Deferred tax liabilities:
Convertible senior notes— (9.9)
Operating lease liabilities(21.0)(23.3)
Other(11.8)(10.7)
Total deferred tax liabilities(32.8)(43.9)
Net of deferred tax assets and liabilities372.9 369.9 
Valuation allowance(67.0)(54.8)
Net deferred tax assets$305.9 $315.1 
Activity related to unrecognized tax benefits
The following table presents a summary of activity related to unrecognized tax benefits.
Year Ended December 31,
(in millions)202220212020
Balance at January 1$64.6 $60.8 $63.9 
Increase (decrease) related to prior year tax positions4.7 0.6 (5.7)
Increase related to current year tax positions15.2 4.9 3.9 
Settlements related to prior year tax positions— — (0.2)
Expiration of the statute of limitations for the assessment of taxes— (1.7)(1.1)
Balance at December 31$84.5 $64.6 $60.8