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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
202020192018
U.S. $(1,046.7)$552.4 $655.0 
International(39.2)110.7 101.2 
Total (before equity earnings)$(1,085.9)$663.1 $756.2 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
202020192018
Current   
Federal$(301.0)$57.8 $159.4 
State(5.5)0.7 4.1 
Foreign(8.1)(12.8)11.4 
Total current$(314.6)$45.7 $174.9 
Deferred   
Federal$(16.2)$71.8 $(27.8)
State106.9 (11.4)(12.8)
Foreign3.7 26.7 5.5 
Total deferred94.4 87.1 (35.1)
Total income tax provision$(220.2)$132.8 $139.8 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
202020192018
Tax at U.S. Federal statutory rate$(228.1)21.0 %$139.3 21.0 %$158.8 21.0 %
State income taxes, net of Federal benefit(28.1)2.6 14.9 2.3 18.1 2.4 
State income tax credits, net of Federal benefit(17.4)1.6 (22.6)(3.4)(22.7)(3.0)
Foreign rate differences(3.3)0.3 (7.1)(1.1)(6.2)(0.8)
Research and experimentation(0.1)— 0.7 0.1 (5.4)(0.7)
Excess tax benefits0.1 — (2.5)(0.4)(4.0)(0.5)
Non-deductible expenses10.5 (1.0)4.0 0.6 4.6 0.6 
Transition tax— — 1.6 0.2 (5.4)(0.7)
Re-measurement of Deferred Taxes1.7 (0.2)(2.0)(0.3)— — 
Global Intangible Low-Taxed Income (GILTI) Tax3.9 (0.4)7.1 1.1 1.8 0.2 
Valuation Allowance150.2 (13.8)— — — — 
NOL Utilized at 35% vs 21%(104.8)9.7 — — — — 
Other(4.8)0.5 (0.6)(0.1)0.2 — 
Total income tax provision$(220.2)20.3 %$132.8 20.0 %$139.8 18.5 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
20202019
Depreciation and amortization$(174.3)$(117.8)
Long-term contracts165.7 107.5 
State income tax credits122.8 108.3 
Net operating loss carryforward98.6 0.4 
Accruals and reserves50.3 40.3 
Employee compensation accruals36.2 39.2 
Pension and other employee benefit plans(15.3)(88.5)
Interest expense limitation22.7 — 
Post retirement benefits other than pensions11.8 9.8 
Other8.0 8.6 
Inventory1.2 0.4 
Interest swap contracts0.3 0.2 
Net deferred tax asset before valuation allowance328.0 108.4 
Valuation allowance(340.9)(10.2)
Net deferred tax (liability)(12.9)98.2 
Schedule of Unrecognized Tax Benefits Roll Forward
202020192018
Beginning balance at January 1$5.4 $7.2 $6.7 
Bombardier Acquisition opening balance sheet14.0 — — 
Gross increases related to current period tax positions0.4 0.4 — 
Gross increases related to prior period tax positions— — 0.5 
Gross decreases related to prior period tax positions— (2.2)— 
Statute of limitations' expiration(3.3)— — 
Settlements— — — 
Ending balance at December 31$16.5 $5.4 $7.2