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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Valuation Allowance [Line Items]  
Components of the provision for income taxes
The components of the provision for income taxes for the years ended December 31, are as follows:
 
 
2013
 
2012
 
2011
Current:
 
 
 
 
 
Federal
$
289.6

 
$
228.7

 
$
201.7

State
35.3

 
29.2

 
38.6

Deferred:
 
 
 
 
 
Federal and state deferred provision
3.8

 
83.9

 
334.8

State deferred benefit - change in valuation allowance
(42.3
)
 

 

Uncertain tax positions and interest, and other
(24.3
)
 
(90.0
)
 
(257.7
)
Provision for income taxes
$
262.1

 
$
251.8

 
$
317.4

Reconciliations of the statutory federal income tax rate to our effective tax rate
The reconciliations of the statutory federal income tax rate to our effective tax rate for the years ended December 31, are as follows: 
 
2013
 
2012
 
2011
Federal statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
State income taxes, net of federal benefit
3.1

 
2.5

 
3.2

Change in valuation allowance
(5.0
)
 

 

Non-deductible expenses
1.0

 
1.1

 
1.6

Uncertain tax position taxes and interest
(1.8
)
 
(4.7
)
 
(2.5
)
Other, net
(1.5
)
 
(3.3
)
 
(2.3
)
Effective income tax rate
30.8
 %
 
30.6
 %
 
35.0
 %
Components of the net deferred income tax asset and liability
The components of the net deferred income tax asset and liability as of December 31, 2013 and 2012 are as follows:
 
 
2013
 
2012
Deferred tax liabilities relating to:
 
 
 
Differences between book and tax basis of property
$
(983.6
)
 
$
(955.6
)
Difference between book and tax basis of intangible assets
(692.5
)
 
(676.5
)
Basis difference due to redemption of partnership interests
(128.5
)
 
(128.6
)
Total liabilities
$
(1,804.6
)
 
$
(1,760.7
)
Deferred tax assets relating to:
 
 
 
Environmental reserves
$
356.0

 
$
348.3

Accruals not currently deductible
244.2

 
232.2

State net operating loss carryforwards
126.4

 
130.2

Difference between book and tax basis of other assets
111.4

 
92.4

Deferred taxes on uncertain tax positions
16.4

 
17.5

Other
5.5

 
5.8

Total assets
859.9

 
826.4

Valuation allowance
(76.9
)
 
(124.8
)
Net deferred tax asset
783.0

 
701.6

Net deferred tax liabilities
$
(1,021.6
)
 
$
(1,059.1
)
Summarization of activity in our gross unrecognized tax benefits
The following table summarizes the activity in our gross unrecognized tax benefits for the years ended December 31: 
 
2013
 
2012
 
2011
Balance at beginning of year
$
84.7

 
$
54.3

 
$
222.8

Additions based on tax positions related to current year
0.3

 
0.9

 

Additions for tax positions of prior years
11.4

 
64.0

 
0.6

Reductions for tax positions of prior years
(2.4
)
 

 
(162.2
)
Reductions for tax positions resulting from lapse of statute of limitations
(1.3
)
 
(7.3
)
 

Settlements
(20.7
)
 
(27.2
)
 
(6.9
)
Balance at end of year
$
72.0

 
$
84.7

 
$
54.3

Valuation Allowance of Deferred Tax Assets [Member]
 
Valuation Allowance [Line Items]  
Changes in the deferred tax valuation allowance
Changes in the deferred tax valuation allowance for the years ended December 31, 2013, 2012 and 2011 are as follows:
 
 
2013
 
2012
 
2011
Valuation allowance, beginning of year
$
124.8

 
$
118.1

 
$
120.1

Additions charged to income
0.1

 
1.9

 
2.1

Realized deferred tax assets
(42.3
)
 
(3.2
)
 
(4.3
)
Expirations of state net operating losses

 
(0.3
)
 
(0.3
)
Other, net
(5.7
)
 
8.3

 
0.5

Valuation allowance, end of year
$
76.9

 
$
124.8

 
$
118.1