Supplemental Quarterly Information (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

	First		Second		Third		Fourth
(Millions of dollars except per share amounts)	Quarter		Quarter		Quarter		Quarter		Year
Year Ended December 31, 2019
Sales and other operating revenues	$	3,116.4	$	3,800.4	$	3,657.6	$	3,460.2	$	14,034.6
Income (loss) from continuing operations before income taxes	$	5.9	$	43.3	$	91.3	$	61.9	$	202.4
Income (loss) from continuing operations	$	5.3	$	32.7	$	69.2	$	47.6	$	154.8
Net income (loss)	$	5.3	$	32.7	$	69.2	$	47.6	$	154.8
Income (loss) from continuing operations (per Common share)
Basic	$	0.16	$	1.02	$	2.20	$	1.56	$	4.90
Diluted	$	0.16	$	1.01	$	2.18	$	1.54	$	4.86
Net income (loss) (per Common share)
Basic	$	0.16	$	1.02	$	2.20	$	1.56	$	4.90
Diluted	$	0.16	$	1.01	$	2.18	$	1.54	$	4.86
Year Ended December 31, 2018
Sales and other operating revenues	$	3,244.2	$	3,829.0	$	3,788	$	3,501.7	$	14,362.9
Income (loss) from continuing operations before income taxes	$	47.3	$	69.1	$	57.0	$	100.5	$	273.9
Income (loss) from continuing operations	$	39.3	$	51.8	$	45.0	$	77.5	$	213.6
Net income (loss)	$	39.3	$	51.8	$	45.0	$	77.5	$	213.6
Income (loss) from continuing operations (per Common share)
Basic	$	1.17	$	1.59	$	1.40	$	2.40	$	6.54
Diluted	$	1.16	$	1.58	$	1.38	$	2.38	$	6.48
Net income (loss) (per Common share)
Basic	$	1.17	$	1.59	$	1.40	$	2.40	$	6.54
Diluted	$	1.16	$	1.58	$	1.38	$	2.38	$	6.48