Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment income	$ 7.8	$ 11.0	$ 24.9	$ 28.9
Income Before Income Taxes	345.4	394.7	1,270.7	1,034.2
Income taxes	111.8	113.1	412.6	319.6
Net Income	233.6	281.6	858.1	714.6
Net Income Per Share:
Basic	$ 0.66	$ 0.78	$ 2.41	$ 1.96
Diluted	$ 0.66	$ 0.77	$ 2.41	$ 1.95
Weighted Average Common Shares Outstanding:
Basic	353.7	363.3	355.5	365.0
Diluted	354.3	364.2	356.3	366.2
Dividends declared per share	$ 0.20	$ 0.18	$ 0.58	$ 0.42
Comprehensive Income	308.9	11.2	916.5	642.3
Truck and Other
Net sales and revenues	3,546.7	3,993.0	12,252.5	10,738.3
Cost of sales and revenues	3,108.5	3,484.0	10,660.9	9,347.4
Research and development	66.8	70.0	212.9	215.9
Selling, general and administrative	113.9	113.1	362.2	331.6
Interest and other expense (income), net	0.3	4.0	(0.2)	7.1
Costs and Expenses, Total	3,289.5	3,671.1	11,235.8	9,902.0
Income Before Income Taxes	257.2	321.9	1,016.7	836.3
Financial Services
Interest and fees	115.5	106.5	336.9	313.4
Operating lease, rental and other income	158.0	157.6	464.1	449.7
Revenues	273.5	264.1	801.0	763.1
Interest and other borrowing expenses	40.6	44.6	118.4	137.2
Depreciation and other expense	127.2	123.0	367.5	352.9
Selling, general and administrative	22.6	24.0	70.8	71.8
Provision for losses on receivables	2.7	10.7	15.2	32.2
Costs and Expenses, Total	193.1	202.3	571.9	594.1
Income Before Income Taxes	$ 80.4	$ 61.8	$ 229.1	$ 169.0