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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option activity [Text Block]
A summary of the plans’ shares under option at December 31, 2014, 2013 and 2012 is as follows:
 
Shares (thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding at January 1, 2012
4,440

 
$
14.68

 
4.1
 
$
76.3

Exercised
(1,568
)
 
$
13.43

 
 
 
$
40.1

Outstanding at December 31, 2012
2,872

 
$
15.33

 
3.4
 
$
58.8

Exercised
(870
)
 
$
14.17

 
 
 
$
25.5

Forfeited
(5
)
 
$
17.48

 
 
 
 
Outstanding at December 31, 2013
1,997

 
$
15.82

 
2.6
 
$
80.0

Exercised
(283
)
 
$
14.04

 
 
 
$
13.8

Outstanding at December 31, 2014
1,714

 
$
16.11

 
1.7
 
$
66.5

 
 
 
 
 
 
 
 
Options exercisable at December 31, 2014
1,714

 
$
16.11

 
1.7
 
$
66.5
Proceeds from stock option exercises [Text Block]
Proceeds from stock option exercises for the years ended December 31, 2014, 2013 and 2012 were as follows:
 
Year Ended December 31,
(millions of dollars)
2014
 
2013
 
2012
Proceeds from stock options exercised — gross
$
4.0

 
$
12.3

 
$
20.9

Tax benefit
12.9

 
20.7

 
31.1

Proceeds from stock options exercised, net of tax
$
16.9

 
$
33.0

 
$
52.0
Restricted stock compensation expense [Text Block]
 
Year Ended December 31,
(millions of dollars, except per share data)
2014
 
2013
 
2012
Restricted stock compensation expense
$
20.7

 
$
25.8

 
$
21.2

Restricted stock compensation expense, net of tax
$
15.1

 
$
18.8

 
$
15.5
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, 2014, 2013 and 2012 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at January 1, 2012
2,860

 
$
19.51

Granted
676

 
$
39.21

Vested
(1,350
)
 
$
13.72

    Forfeited
(122
)
 
$
27.18

Nonvested at December 31, 2012
2,064

 
$
29.39

Granted
782

 
$
37.82

Vested
(1,322
)
 
$
24.36

Forfeited
(113
)
 
$
36.59

Nonvested at December 31, 2013
1,411

 
$
37.86

Granted
447

 
$
54.36

Vested
(530
)
 
$
37.42

Forfeited
(62
)
 
$
41.14

Nonvested at December 31, 2014
1,266

 
$
43.57
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, 2014, 2013 and 2012 were as follows:
 
Year Ended December 31,
 (millions of dollars, except share data)
2014
 
2013*
 
2012*
Expense
$
11.4

 
$
10.8

 
$
35.5

Number of shares
—

 
545,375

 
1,116,000


________________
*Shares were issued in February of the following year.