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Restatement of Previously Issued Financial Statements (Tables)
 9 Months Ended
Sep. 30, 2012
Accounting Changes and Error Corrections [Abstract]  
Restatement of Previously Issued Financial Statements
The following is a summary of the effects of the restatement on the Company's Statements of Consolidated Income, Statements of Comprehensive Income and Statements of Cash Flows for the quarter and nine months ended September 30, 2011 (in millions of dollars, except per share amounts):
 
 
 
 
 
 
 
Quarter ended September 30, 2011
 
Previously Reported
 
Adjustment
 
Restated
Statements of Consolidated Income:
 
 
 
 
 
Selling, administrative, research and development, and general
$
13.1

 
$
0.6

 
$
13.7

Total costs and expenses
316.8

 
0.6

 
317.4

Operating income
5.5

 
(0.6
)
 
4.9

Income before income taxes
5.1

 
(0.6
)
 
4.5

Income tax provision
(0.7
)
 
0.3

 
(0.4
)
Net income
$
4.4

 
$
(0.3
)
 
$
4.1

Earnings per common share, Basic:
 
 
 
 
 
Net income per share
$
0.23

 
$
(0.02
)
 
$
0.21

Earnings per common share, Diluted:
 
 
 
 
 
Net income per share1
$
0.23

 
$
(0.02
)
 
$
0.21

 
 
 
 
 
 
 
Nine months ended September 30, 2011
 
Previously Reported
 
Adjustment
 
Restated
Statements of Consolidated Income:
 
 
 
 
 
Selling, administrative, research and development, and general
$
45.3

 
$
2.0

 
$
47.3

Total costs and expenses
942.3

 
2.0

 
944.3

Operating income
41.4

 
(2.0
)
 
39.4

Income before income taxes
30.4

 
(2.0
)
 
28.4

Income tax provision
(10.2
)
 
0.8

 
(9.4
)
Net income
$
20.2

 
$
(1.2
)
 
$
19.0

Earnings per common share, Basic:
 
 
 
 
 
Net income per share
$
1.06

 
$
(0.06
)
 
$
1.00

Earnings per common share, Diluted:
 
 
 
 
 
Net income per share1
$
1.06

 
$
(0.06
)
 
$
0.99

 
 
 
 
 
 
Statements of Consolidated Comprehensive Income:2
 
 
 
 
 
Net income
$
20.2

 
$
(1.2
)
 
$
19.0

Other comprehensive income:
 
 
 
 
 
Reclassification adjustments:
 
 
 
 
 
  Amortization of net actuarial loss
—

 
0.4

 
0.4

  Less: tax impact on amortization of net actuarial loss
—

 
(0.2
)
 
(0.2
)
  Amortization of prior service cost
—

 
3.1

 
3.1

  Less: tax impact on amortization of prior service cost
—

 
(1.2
)
 
(1.2
)
Other comprehensive income, net of tax
0.1

 
2.2

 
2.3

Comprehensive income
$
20.3

 
$
1.0

 
$
21.3

 
 
 
 
 
 
Statements of Consolidated Cash Flows:
 
 
 
 
 
Net income
$
20.2

 
$
(1.2
)
 
$
19.0

Deferred income taxes
10.8

 
(0.8
)
 
10.0

Non-cash net periodic benefit income
(6.5
)
 
2.0

 
(4.5
)
______________________________
1 
Beginning 2012, the Company presented diluted earnings per share under the treasury method because it became more dilutive than the diluted earnings per share under the two-class method. As such, restated diluted earnings per share for the quarter and nine months ended September 30, 2011 were calculated based on the treasury method to conform to current period presentation. Previously reported diluted earnings per share for the quarter and nine months ended September 30, 2011 are based on the two-class method. The "Adjustment" column reflects the difference between restated diluted earnings per share using the two-class method and the previously reported diluted earnings per share.
2 
Total comprehensive income and components of other comprehensive income (loss) were previously included in the Statement of Stockholders' Equity for interim reporting periods prior to 2012. The Company adopted ASU No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income, beginning with the annual period ended December 31, 2011 and presented the Statement of Comprehensive Income as its own separate statement. As such, the "Previously Reported" column reflects the changes in the presentation.