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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option activity [Text Block]
 
Shares (thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding at January 1, 2016
1,267

 
$
16.59

 
0.9
 
$
33.7

Exercised
(794
)
 
$
16.07

 
 
 
$
14.4

Outstanding at December 31, 2016
473

 
$
17.47

 
0.1
 
$
10.4

Exercised
(473
)
 
$
17.47

 
 
 
$
10.4

Outstanding at December 31, 2017

 
$

 
0.0
 
$

Exercised

 
$

 

 
$

Outstanding at December 31, 2018

 
$

 
0.0
 
$

 
 
 
 
 
 
 
 
Options exercisable at December 31, 2018

 
$

 
0.0
 
$

Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block]
 
Year Ended December 31,
(millions of dollars)
2018
 
2017
 
2016
Proceeds from stock options exercised — gross
$

 
$
8.3

 
$
12.7

Tax benefit

 
8.2

 
0.3

Proceeds from stock options exercised, net of tax
$

 
$
16.5

 
$
13.0

Restricted stock compensation expense [Text Block]
 
Year Ended December 31,
(millions of dollars, except per share data)
2018
 
2017
 
2016
Restricted stock compensation expense
$
25.9

 
$
27.0

 
$
26.7

Restricted stock compensation expense, net of tax
$
19.7

 
$
19.7

 
$
19.5

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
Shares subject to restriction
(thousands)
 
Weighted average grant date fair value
Nonvested at January 1, 2016
1,326

 
$
53.18

Granted
724

 
$
30.07

Vested
(551
)
 
$
47.55

    Forfeited
(70
)
 
$
43.05

Nonvested at December 31, 2016
1,429

 
$
44.12

Granted
804

 
$
40.10

Vested
(521
)
 
$
56.53

Forfeited
(119
)
 
$
38.97

Nonvested at December 31, 2017
1,593

 
$
38.86

Granted
737

 
$
51.70

Vested
(556
)
 
$
42.25

Forfeited
(258
)
 
$
44.51

Nonvested at December 31, 2018
1,516

 
$
42.97

Share-based Compensation, Performance Shares Award Nonvested Activity [Table Text Block]
 
Number of shares
(thousands)
 
Weighted average grant date fair value
Nonvested at January 1, 2016
475

 
$
56.55

Granted
171

 
$
16.61

Forfeited
(236
)
 
$
49.37

Nonvested at December 31, 2016
410

 
$
43.99

Granted
201

 
$
45.57

Forfeited
(256
)
 
$
61.40

Nonvested at December 31, 2017
355

 
$
32.35

Granted
287

 
$
68.38

Forfeited
(345
)
 
$
38.26

Nonvested at December 31, 2018
297

 
$
60.35


 
Year Ended December 31,
 (millions of dollars, except share data)
2018
 
2017
 
2016
Expense
$
18.0

 
$
15.9

 
$
7.1

Number of shares
249,000

 
126,000

 


A summary of the status of the Company’s nonvested relative revenue growth performance shares at December 31, 2018, 2017 and 2016 is as follows:
 
Number of shares
(thousands)
 
Weighted average grant date fair value
Nonvested at January 1, 2016

 
$

Granted
485

 
$
38.62

Vested
(126
)
 
$
38.62

Forfeited
(39
)
 
$
38.62

Nonvested at December 31, 2016
320

 
$
38.62

Granted
198

 
$
40.08

Vested
(156
)
 
$
38.62

Forfeited
(7
)
 
$
39.20

Nonvested at December 31, 2017
355

 
$
39.42

Granted
287

 
$
50.82

Vested
(166
)
 
$
38.62

Forfeited
(179
)
 
$
45.82

Nonvested at December 31, 2018
297

 
$
47.03

 
Year Ended December 31,
 (millions of dollars, except share data)
2018
 
2017
 
2016
Expense
$
9.0

 
$
9.9

 
$
9.6

Number of shares