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Income Taxes Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The income tax expense (benefit) is as follows (in millions):
Year Ended December 31,
202220212020
Current:
  Federal$— $— $— 
  State and local1.0 0.4 0.5 
  Foreign— — — 
1.0 0.4 0.5 
Deferred:
  Federal (a)14.9 (40.7)— 
  State and local(0.3)1.2 (1.9)
  Foreign— — — 
14.6 (39.5)(1.9)
Income tax expense (benefit)$15.6 $(39.1)$(1.4)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Future tax consequences of temporary differences between the carrying amounts for financial reporting purposes and the Company’s estimate of the tax bases of its assets and liabilities result in deferred tax assets and liabilities, as follows (in millions):
December 31,
20222021
Deferred tax assets:
Employee benefits costs
$33.5 $36.2 
Inventory
21.3 18.6 
Property, plant and equipment
190.2 191.5 
Research and experimental expenditures3.5 — 
Net operating loss and credit carryforwards188.6 206.2 
Accrued expenses
4.9 0.4 
Long-term debt and financing costs
7.6 10.8 
Lease liability
2.1 0.9 
Other
0.4 0.2 
Deferred tax assets
452.1 464.8 
Valuation allowance
(414.1)(414.7)
Deferred tax assets, net of valuation allowance
$38.0 $50.1 
Deferred tax liabilities:
Intangible assets
$9.0 $7.9 
Lease asset
1.8 0.4 
Prepaid expenses
0.4 0.4 
Deferred tax liabilities
$11.2 $8.7 
Deferred tax assets, net$26.8 $41.4 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of income taxes calculated based on the federal statutory income tax rate and the effective tax rate follows:
Year Ended December 31,
202220212020
Federal statutory tax rate21 %21 %21 %
Valuation allowance against net deferred tax assets(1)(53)(26)
State rate changes(1)
Executive compensation
State income tax expense, net of federal benefit(1)— 
Uncertain tax positions— 
Effective tax rate
23 %(29)%(3)%
Summary of Income Tax Contingencies [Table Text Block]
A reconciliation of the beginning and ending amount of unrecognized tax benefits follows (in millions):
Year Ended December 31,
20222021
Balance at beginning of the period$1.0 $0.8 
Additions to tax positions of current period0.9 0.4 
Reductions to tax positions of prior years— (0.2)
Balance at end of the period$1.9 $1.0