QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Data [Abstract]

Schedule of quarterly financial information

Quarterly financial data (unaudited) were as follows (dollars in millions, except per share data):

2016	1st Qtr.			2nd Qtr.		3rd Qtr.		4th Qtr.
Revenues	$	960.4		$	1,003.9	$	1,015.9	$	1,004.9
Income before income taxes	$	40.5		$	82.7	$	49.3	$	180.7
Income tax expense (benefit)	(5.0		)	22.8		30.7		(53.5		)
Net income	$	45.5		$	59.9	$	18.6	$	234.2
Earnings per common share:
Basic:
Net income	$	.25		$	.34	$	.11	$	1.35
Diluted:
Net income	$	.25		$	.33	$	.11	$	1.34
2015	1st Qtr.			2nd Qtr.		3rd Qtr.		4th Qtr.
Revenues	$	978.3		$	959.5	$	904.5	$	969.6
Income before income taxes	$	82.3		$	72.7	$	52.4	$	160.3
Income tax expense	29.5			25.9		18.6		23.0
Net income	$	52.8		$	46.8	$	33.8	$	137.3
Earnings per common share:
Basic:
Net income	$	.26		$	.24	$	.18	$	.74
Diluted:
Net income	$	.26		$	.24	$	.18	$	.73