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Supplemental Balance Sheet Data (Tables)
 12 Months Ended
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]  
Receivables, Net
The following tables provide disclosure related to the components of certain line items included in our consolidated balance sheets.

Receivables, Net:

In millions20192018
Trade
$462.7  $475.9  
Less: Allowance
(11.5) (10.4) 
451.2  465.5  
Other
49.0  104.8  
Total
$500.2  $570.3  
Inventories, Net by major class
Inventories, Net by major class:

In millions20192018
Finished Goods
$434.8  $426.9  
Work in Progress
123.4  102.2  
Raw Materials
370.0  319.9  
Supplies
167.7  165.4  
Total
$1,095.9  $1,014.4  
Other Current Assets
Other Current Assets:

In millions20192018
Deferred Purchase Price
$0.7  $66.9  
Prepaid Assets
39.0  24.7  
Contract Assets, current portion
10.4  9.8  
Fair Value of Derivatives, current portion
—  0.7  
Total
$50.1  $102.1  
Property, Plant and Equipment, Net
Depreciation is computed using the straight-line method based on the following estimated useful lives of the related assets:

Buildings
40 years
Land improvements
15 years
Machinery and equipment
3 to 40 years
Furniture and fixtures
10 years
Automobiles, trucks and tractors
3 to 5 years
Property, Plant and Equipment, Net:

In millions20192018
Property, Plant and Equipment, at Cost:
Land and Improvements
$130.4  $134.1  
Buildings (a)
655.5  608.5  
Machinery and Equipment (b) 
5,832.6  5,716.2  
Construction-in-Progress
202.6  201.2  
6,821.1  6,660.0  
Less: Accumulated Depreciation (a) (b)
(3,567.3) (3,420.3) 
Total
$3,253.8  $3,239.7  

(a) Includes gross assets under finance lease of $105.5 million and related accumulated depreciation of $5.4 million as of December 31, 2019, and gross assets under finance lease of $95.5 million and related accumulated depreciation of $0.4 million as of December 31, 2018.
(b) Includes gross assets under finance lease of $36.6 million and related accumulated depreciation of $6.8 million as of December 31, 2019 and gross assets under finance lease of $39.6 million and related accumulated depreciation of $10.0 million as of December 31, 2018.
Other Assets
Other Assets:

In millions20192018
Deferred Debt Issuance Costs, Net of Amortization of $14.1 million and $12.5 million for 2019 and 2018, respectively 
$4.8  $6.4  
Deferred Income Tax Assets
3.0  8.3  
Pension Assets
25.6  19.0  
Contract Assets, noncurrent portion
13.9  9.8  
Fair Value of Derivatives, noncurrent portion
—  0.1  
Operating Lease Right-of-Use Asset
202.8  —  
Other
23.6  24.7  
Total
$273.7  68.3
Other Accrued Liabilities
Other Accrued Liabilities:

In millions20192018
Deferred Revenue
15.2  14.0  
Accrued Customer Rebates
36.5  30.2  
Fair Value of Derivatives, current portion
8.5  1.3  
Other Accrued Taxes
38.0  42.2  
Accrued Payables
31.4  30.3  
Liabilities Payable to a Financial Institution
—  62.6  
Operating Lease Liabilities, current portion
54.8  —  
Other
32.5  35.3  
Total
$216.9  $215.9  
Other Noncurrent Liabilities
Other Noncurrent Liabilities:

In millions20192018
Deferred Revenue
$5.3  $5.2  
Multi-employer Plans
30.8  32.4  
Workers Compensation Reserve
9.5  9.9  
Fair Value of Derivatives, noncurrent portion
3.0  2.1  
Unfavorable Supply Agreement
28.9  31.2  
Operating Lease Liabilities, noncurrent portion
151.5  —  
Other
36.6  36.1  
Total
$265.6  116.9