Supplemental Quarterly Information (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Quarterly Information [Abstract]

Schedule of Supplemental Quarterly Information

(Millions of dollars except per share amounts)	First Quarter		Second Quarter	Third Quarter	Fourth Quarter	Year
Year Ended December 31, 2014
Sales and other operating revenues	$	1,281.2	1,357.9	1,431.0	1,218.8	5,288.9
Income from continuing operations before     income taxes		334.2	304.6	396.5	217.0	1,252.3
Income from continuing operations		169.3	142.7	271.0	442.0	1,025.0
Net income		155.3	129.4	245.7	375.2	905.6
Income from continuing operations per     Common share
Basic		0.94	0.80	1.52	2.49	5.73
Diluted		0.93	0.79	1.51	2.48	5.69
Net income per Common share
Basic		0.86	0.72	1.38	2.11	5.06
Diluted		0.85	0.72	1.37	2.10	5.03
Cash dividend per Common share		0.3125	0.3125	0.35	0.35	1.325
Market price of Common Stock*
High		63.70	66.82	67.75	56.13	67.75
Low		55.68	59.61	56.18	44.39	44.39
Year Ended December 31, 2013
Sales and other operating revenues	$	1,298.9	1,315.6	1,366.5	1,331.7	5,312.7
Income from continuing operations before     income taxes		360.0	454.2	463.7	194.8	1,472.7
Income from continuing operations		182.7	259.9	265.0	180.5	888.1
Net income		360.6	402.7	284.8	75.4	1,123.5
Income from continuing operations per     Common share
Basic		0.96	1.38	1.42	0.98	4.73
Diluted		0.95	1.37	1.41	0.96	4.69
Net income per Common share
Basic		1.89	2.13	1.52	0.41	5.98
Diluted		1.88	2.12	1.51	0.40	5.94
Cash dividend per Common share		0.3125	0.3125	0.3125	0.3125	1.25
Market price of Common Stock*
High		63.81	66.09	71.84	65.55	71.84
Low		59.33	59.98	59.80	59.93	59.33

*Prices are as quoted on the New York Stock Exchange.