Income Taxes (Tables)

9 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Schedule of effective income tax expense (benefit) and effective income tax rate

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)	2020			2019			2020			2019
Income tax expense	$	2.7		$	43.2		$	14.0		$	38.4
Effective income tax rate	8.5		%	94.5		%	13.9		%	(317.4)		%