Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Proceeds from stock option exercises [Text Block]

Proceeds from stock option exercises for the years ended December 31, 2012, 2011 and 2010 were as follows:

	Year Ended December 31,
(millions of dollars)	2012		2011		2010
Proceeds from stock options exercised — gross	$	20.9	$	28.6	$	55.4
Tax benefit	31.1		24.4		11.7
Proceeds from stock options exercised, net of tax	$	52.0	$	53.0	$	67.1

Restricted stock compensation expense [Text Block]

	Year Ended December 31,
(millions of dollars, except per share data)	2012		2011		2010
Restricted stock compensation expense	$	21.2	$	15.1	$	18.9
Restricted stock compensation expense, net of tax	$	15.5	$	11.4	$	14.7

Status of nonvested restricted stock [Text Block]

A summary of the status of the Company’s nonvested restricted stock for employees and non-employee directors at December 31, 2012, 2011 and 2010 is as follows:

	Shares subject to restriction (thousands)		Weighted average price
Nonvested at January 1, 2010	1,547		$	29.90
Granted	603		$	36.16
Vested	(188	)	$	44.80
Forfeited	(91	)	$	27.10
Nonvested at December 31, 2010	1,871		$	30.55
Granted	274		$	70.57
Vested	(609	)	$	27.39
Forfeited	(106	)	$	38.05
Nonvested at December 31, 2011	1,430		$	39.02
Granted	338		$	78.41
Vested	(675	)	$	27.43
Forfeited	(61	)	$	54.35
Nonvested at December 31, 2012	1,032		$	58.77

Amounts expensed under plan and share issuances [Text Block]

The amounts expensed under the plan and the share issuances for the three-year measurement periods ended December 31, 2012, 2011 and 2010 were as follows:

	Year Ended December 31,
(millions of dollars, except share data)	2012		2011		2010
Expense	$	35.5	$	26.3	$	23.9
Number of shares*	558,000		538,180		104,205

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*Shares are issued in February of the following year.