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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]  
Components of income tax provision
 
Years ended December 31,
Components of Income Before Taxes
2013
 
2012
 
2011
 
($ in millions)
Domestic
$
222.2

 
$
189.9

 
$
360.3

Foreign
27.8

 
35.3

 
19.1

Income before taxes
$
250.0

 
$
225.2

 
$
379.4

Components of Income Tax Provision
 
 
 
 
 
Current expense:
 
 
 
 
 
Federal
$
42.1

 
$
16.9

 
$
36.4

State
9.4

 
4.3

 
5.7

Foreign
8.5

 
10.4

 
5.5

 
60.0

 
31.6

 
47.6

Deferred
11.4

 
44.0

 
90.1

Income tax provision
$
71.4

 
$
75.6

 
$
137.7

Effective tax rate reconciliation
The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35% to the income before taxes.

 
Years ended December 31,
Effective Tax Rate Reconciliation (Percent)
2013
 
2012
 
2011
Statutory federal tax rate
35.0
 %
 
35.0
 %
 
35.0
 %
Foreign rate differential
(0.1
)
 
(0.1
)
 
(0.1
)
Domestic manufacturing/export tax incentive
(1.6
)
 
(1.0
)
 
(1.0
)
Dividends paid to CEOP
(0.3
)
 
(0.4
)
 
(0.3
)
State income taxes, net
2.3

 
1.3

 
1.1

Change in tax contingencies
(3.8
)
 
0.5

 
(1.1
)
Change in valuation allowance
(2.1
)
 
0.1

 
0.1

Return to provision
(0.1
)
 

 
0.5

Remeasurement of deferred taxes
0.1

 
0.7

 
(1.3
)
Research tax credit
(0.8
)
 

 

Section 45O tax credit

 
(3.0
)
 

Australia dividend residual tax expense

 
0.3

 

Incremental tax effect of SunBelt remeasurement

 

 
3.3

Other, net

 
0.2

 
0.1

Effective tax rate
28.6
 %
 
33.6
 %
 
36.3
 %
Components of deferred tax assets and liabilities
 
December 31,
Components of Deferred Tax Assets and Liabilities
2013
 
2012
 
($ in millions)
Deferred tax assets:
 
Pension and postretirement benefits
$
74.6

 
$
93.3

Environmental reserves
60.2

 
60.5

Asset retirement obligations
25.7

 
28.6

Accrued liabilities
48.2

 
43.1

Tax credits
13.3

 
10.8

Federal and state net operating losses
7.2

 
6.7

Capital loss carryforward
3.0

 
15.5

Other miscellaneous items
10.7

 
5.3

Total deferred tax assets
242.9

 
263.8

Valuation allowance
(13.4
)
 
(21.1
)
Net deferred tax assets
229.5

 
242.7

Deferred tax liabilities:
 
 
 
Property, plant and equipment
182.5

 
178.9

Intangible amortization
8.4

 
8.8

Inventory and prepaids
3.1

 

Partnerships
93.7

 
95.0

Total deferred tax liabilities
287.7

 
282.7

Net deferred tax liability
$
(58.2
)
 
$
(40.0
)
Unrecognized tax benefits
 
December 31,
 
2013
 
2012
 
($ in millions)
Beginning balance
$
40.1

 
$
37.9

Increase for prior year tax positions
4.5

 
3.1

Reductions due to statute of limitations
(10.0
)
 
(0.3
)
Decrease for prior year tax positions
(0.1
)
 
(0.4
)
Increase for current year tax positions

 
0.1

Decrease due to tax settlements

 
(0.3
)
Ending balance
$
34.5

 
$
40.1

Tax years subject to examination
For our primary tax jurisdictions, the tax years that remain subject to examination are as follows:

 
Tax Years
U.S. federal income tax
2008; 2010 - 2012
U.S. state income tax
2006 - 2012
Canadian federal income tax
2009 - 2012
Canadian provincial income tax
2008 - 2012