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Supplementary Financial Statement Information (Tables)
 12 Months Ended
Dec. 31, 2012
Supplementary Financial Statement Information [Abstract]  
Related party transactions
The following relates to the Company’s transactions with these equity investees for the years indicated:
 
2012
 
2011
 
2010
Sales to equity investees
$
60.4

 
$
52.8

 
$
41.2

Purchases from equity investees
11.8

 
12.4

 
16.1


The following is the Company’s outstanding receivables and payables with the above equity investees as of the end of the year indicated:
 
2012
 
2011
Accounts receivable from equity investees
$
2.3

 
$
2.7

Accounts payable to equity investees
1.1

 
0.9

Notes receivable from equity investees
7.6

 
7.6
Allowance for doubtful accounts
The following shows changes in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010:
 
2012
 
2011
 
2010
Balance at beginning of year
$
11.9

 
$
13.1

 
$
13.4

Increase (decrease) in allowance
(2.7
)
 
(1.1
)
 
1.4

Receivables written off
(0.1
)
 
(0.1
)
 
(1.7
)
Balance at end of year
$
9.1

 
$
11.9

 
$
13.1
Inventories
Inventories as of December 31, 2012 and 2011, consist of:
 
2012
 
2011
Finished and semi-finished
$
728.5

 
$
640.1

Raw materials
315.7

 
302.6

Total cost
1,044.2

 
942.7

Adjustment to state inventories at LIFO value
(435.0
)
 
(524.0
)
Net inventories
$
609.2

 
$
418.7
Change in LIFO reserve
The following shows changes in the LIFO reserve for the years ended December 31, 2012, 2011 and 2010:
 
2012
 
2011
 
2010
Balance at beginning of year
$
524.0

 
$
514.2

 
$
405.2

Change in reserve
(89.0
)
 
9.8

 
109.0

Balance at end of year
$
435.0

 
$
524.0

 
$
514.2
Property, plant and equipment
The Company’s property, plant and equipment balances as of December 31, 2012 and 2011 are as follows:
 
2012
 
2011
Land, land improvements and leaseholds
$
239.8

 
$
217.2

Buildings
428.3

 
397.8

Machinery and equipment
5,224.4

 
5,303.9

Construction in progress
51.4

 
48.3

Total
5,943.9

 
5,967.2

Less accumulated depreciation
(3,931.6
)
 
(3,797.0
)
Property, plant and equipment, net
$
2,012.3

 
$
2,170.2
Asset retirement obligations

The following reflects changes in the carrying amounts of asset retirement obligations for the years ended December 31, 2012, 2011 and 2010:
 
2012
 
2011
 
2010
Balance at beginning of year
$
5.8

 
$
5.3

 
$
4.9

Adjustment to obligations
(0.9
)
 
—

 
—

Accretion expense
0.5

 
0.5

 
0.4

Balance at end of year
$
5.4

 
$
5.8

 
$
5.3