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Income taxes
9 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Income taxes
10. Income taxes
The income tax expense and effective income tax rate for the three and nine months ended September 30, 2020 and 2019 were as follows:
Three months ended September 30,Nine months ended September 30,
(dollars in millions)2020201920202019
Income tax expense$2.7 $43.2 $14.0 $38.4 
Effective income tax rate8.5 %94.5 %13.9 %(317.4)%
Discrete tax benefits of $13.9 million are included in the $2.7 million income tax expense for the three months ended September 30, 2020 primarily attributable to 2019 return to provision adjustments and impairment of unrealizable assets, offset by a reserve for uncertain tax positions. The Company’s effective income tax rate without discrete items was 26.8%, higher than the US federal statutory rate of 21.0% primarily due to the impact of higher tax rates in foreign jurisdictions, non-deductible expenses and US state income taxes.
Discrete tax benefits of $27.5 million are included in the $14.0 million income tax expense for the nine months ended September 30, 2020 primarily attributable to 2019 return to provision adjustments, impairment of unrealizable assets and benefits from provisions under the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”), offset by a reserve for uncertain tax positions. The Company’s effective income tax rate without discrete items was 29.9%, higher than the US federal statutory rate of 21.0% primarily due to the impact of higher tax rates in foreign jurisdictions, non-deductible expenses and US state income taxes.
Discrete tax expense of $9.1 million and discrete tax benefit of $4.9 million are included in the $43.2 million and $38.4 million income tax expense for the three and nine months ended September 30, 2019. The Company’s effective income tax rate without discrete items was 68.4%, higher than the US federal statutory rate of 21.0%, primarily due to the impact of non-deductible Nexeo related acquisition and integration costs, along with state taxes, foreign rate differential, non-deductible compensation and other expenses, and an increase in the valuation allowance on certain income tax attributes.