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Supplementary Financial Statement Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplementary Financial Statement Information [Abstract]  
Allowance for doubtful accounts Changes in the allowance for doubtful accounts for the years ended December 31, 2017, 2016 and 2015, are presented below:
 
2017
 
2016
 
2015
Balance at beginning of year
$
7.8

 
$
6.0

 
$
9.0

Increase (decrease) in allowance
(1.0
)
 
2.4

 
(3.0
)
Receivables written off
—

 
(0.6
)
 
—

Balance at end of year
$
6.8

 
$
7.8

 
$
6.0
Inventory, net Inventories as of December 31, 2017 and 2016, consist of:
 
2017
 
2016
Finished and semi-finished
$
1,009.6

 
$
855.0

Raw materials
408.5

 
415.8

Total cost
1,418.1

 
1,270.8

Adjustment to state inventories at LIFO value
(270.3
)
 
(156.9
)
Inventory, net
$
1,147.8

 
$
1,113.9
Change in LIFO reserve Changes in the LIFO reserve for the years ended December 31, 2017, 2016 and 2015, are presented below:
 
2017
 
2016
 
2015
Balance at beginning of year
$
156.9

 
$
180.2

 
$
375.5

Change in reserve
113.4

 
(23.3
)
 
(195.3
)
Balance at end of year
$
270.3

 
$
156.9

 
$
180.2
Property, plant and equipment Property, plant and equipment as of December 31, 2017 and 2016, consist of:
 
2017
 
2016
Land, land improvements and leaseholds
$
275.3

 
$
272.6

Buildings
509.0

 
489.6

Machinery and equipment
5,958.2

 
5,714.0

Construction in progress
89.3

 
92.8

Total
6,831.8

 
6,569.0

Less accumulated depreciation
(4,845.6
)
 
(4,554.6
)
Property, plant and equipment, net
$
1,986.2

 
$
2,014.4
Goodwill Changes in goodwill for the years ended December 31, 2017, 2016 and 2015 are presented below:
 
2017
 
2016
 
2015
Balance at beginning of year
$
32.8

 
$
32.8

 
$
32.8

Acquisition
221.0

 
—

 
—

Balance at end of year
$
253.8

 
$
32.8

 
$
32.8
Intangible assets Intangible assets at December 31, 2017, consist of:
 
Gross Amount
 
Accumulated Amortization
 
Net Amount
Customer relationships
$
36.6

 
$
(2.2
)
 
$
34.4

Technology
19.3

 
(1.4
)
 
17.9

Other
1.0

 
(0.4
)
 
0.6

Intangible assets
$
56.9

 
$
(4.0
)
 
$
52.9
Other non-current assets Other non-current assets as of December 31, 2017 and 2016, consist of:
 
2017
 
2016
Investments in affiliates
$
77.5

 
$
76.7

Deferred tax assets
58.9

 
53.2

Other
32.9

 
35.2

Other non-current assets
$
169.3

 
$
165.1
Accrued liabilities Accrued liabilities as of December 31, 2017 and 2016, consist of:
 
2017
 
2016
Salaries, wages and benefits
$
101.3

 
$
105.6

Interest
35.0

 
35.2

Other
134.2

 
93.3

Accrued liabilities
$
270.5

 
$
234.1
Facility idling The supplemental unemployment and other employee benefit costs were recorded as accrued liabilities, and the activity for the years ended December 31, 2017 and 2016 was as follows:
 
 
2017
 
2016
Balance at beginning of year
 
$
6.1

 
$
22.1

Payments
 
(5.3
)
 
(20.1
)
Additions to the reserve
 
0.6

 
4.1

Balance at end of year
 
$
1.4

 
$
6.1