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Supplementary Financial Statement Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplementary Financial Statement Information [Abstract]  
Disaggregation of Revenue Net sales by market are presented below:
 
2018
 
2017
 
2016
Automotive
$
4,284.7

 
$
3,951.5

 
$
3,906.8

Infrastructure and Manufacturing
1,049.1

 
948.0

 
936.7

Distributors and Converters
1,484.4

 
1,181.0

 
1,039.0

Total
$
6,818.2

 
$
6,080.5

 
$
5,882.5


Net sales by product line are presented below:
 
2018
 
2017
 
2016
Carbon steel
$
4,409.1

 
$
4,034.5

 
$
4,014.5

Stainless and electrical steel
1,793.8

 
1,687.6

 
1,654.1

Tubular products, components and other
615.3

 
358.4

 
213.9

Total
$
6,818.2

 
$
6,080.5

 
$
5,882.5
Allowance for doubtful accounts Changes in the allowance for doubtful accounts for the years ended December 31, 2018, 2017 and 2016, are presented below:
 
2018
 
2017
 
2016
Balance at beginning of year
$
6.8

 
$
7.8

 
$
6.0

Increase (decrease) in allowance
0.3

 
(1.0
)
 
2.4

Receivables written off
(0.5
)
 
—

 
(0.6
)
Balance at end of year
$
6.6

 
$
6.8

 
$
7.8
Inventory Inventories as of December 31, 2018 and 2017, consist of:
 
2018
 
2017
Finished and semi-finished
$
1,054.4

 
$
996.8

Raw materials
365.5

 
388.2

Inventory
$
1,419.9

 
$
1,385.0
Schedule of Changes in Accounting Principles The effects of the change in accounting principle from LIFO to average cost have been retrospectively applied to all periods presented. As a result of the retrospective application of the change in accounting principle, certain financial statement line items in our consolidated balance sheet as of December 31, 2017 and our consolidated statements of operations, comprehensive income and cash flows for years ended December 31, 2017 and 2016 were adjusted as follows:
 
As Originally Reported
 
Effect of Change
 
As Adjusted
Consolidated statement of operations for the year ended December 31, 2017:
 
 
 
 
 
Cost of products sold (a)
$
5,365.2

 
$
(112.1
)
 
$
5,253.1

Income tax expense (benefit)
(17.0
)
 
14.8

 
(2.2
)
Net income
67.6

 
97.3

 
164.9

Net income attributable to AK Steel Holding Corporation
6.2

 
97.3

 
103.5

Net income per share attributable to AK Steel Holding Corporation common stockholders:
 
 
 
 
 
Basic
$
0.02

 
$
0.31

 
$
0.33

Diluted
0.02

 
0.30

 
0.32

 
 
 
 
 
 
Consolidated statement of comprehensive income for the year ended December 31, 2017:
 
 
 
 
 
Cash flow hedges—Reclassification of losses (gains) to net income
$
(12.5
)
 
$
6.4

 
$
(6.1
)
Comprehensive income
91.1

 
112.3

 
203.4

Comprehensive income attributable to AK Steel Holding Corporation
29.7

 
112.3

 
142.0

 
 
 
 
 
 
Consolidated balance sheet as of December 31, 2017:
 
 
 
 
 
Inventory
$
1,147.8

 
$
237.2

 
$
1,385.0

Other non-current assets
169.3

 
(58.5
)
 
110.8

Other non-current liabilities
161.6

 
7.3

 
168.9

Accumulated deficit
(3,058.6
)
 
181.6

 
(2,877.0
)
Accumulated other comprehensive loss
(40.0
)
 
(10.2
)
 
(50.2
)
 
 
 
 
 
 
Consolidated statement of cash flows for the year ended December 31, 2017:
 
 
 
 
 
Net income
$
67.6

 
$
97.3

 
$
164.9

Deferred income taxes
(15.2
)
 
6.2

 
(9.0
)
Changes in working capital
1.8

 
(118.5
)
 
(116.7
)
Other operating items, net
5.1

 
15.0

 
20.1

 
 
 
 
 
 
Consolidated statement of operations for the year ended December 31, 2016:
 
 
 
 
 
Cost of products sold (a)
$
5,070.6

 
$
29.1

 
$
5,099.7

Income tax expense (benefit)
3.2

 
(20.1
)
 
(16.9
)
Net income
58.2

 
(9.0
)
 
49.2

Net income attributable to AK Steel Holding Corporation
(7.8
)
 
(9.0
)
 
(16.8
)
Net income per share attributable to AK Steel Holding Corporation common stockholders:
 
 
 
 
 
Basic
$
(0.03
)
 
$
(0.04
)
 
$
(0.07
)
Diluted
(0.03
)
 
(0.04
)
 
(0.07
)
 
 
 
 
 
 
Consolidated statement of comprehensive income for the year ended December 31, 2016:
 
 
 
 
 
Cash flow hedges—Reclassification of losses (gains) to net income
$
27.2

 
$
11.9

 
$
39.1

Comprehensive income
181.9

 
(8.1
)
 
173.8

 
As Originally Reported
 
Effect of Change
 
As Adjusted
Comprehensive income attributable to AK Steel Holding Corporation
115.9

 
(8.1
)
 
107.8

 
 
 
 
 
 
Consolidated statement of cash flows for the year ended December 31, 2016:
 
 
 
 
 
Net income
$
58.2

 
$
(9.0
)
 
$
49.2

Deferred income taxes
5.0

 
(9.1
)
 
(4.1
)
Changes in working capital
112.4

 
17.2

 
129.6

Other operating items, net
2.1

 
0.9

 
3.0

(a)
Cost of products sold as originally reported reflects the change in presentation of pension and OPEB (income) expense further described in Note 1.

The following table shows the effects of the change in accounting principle from LIFO to average cost as of December 31, 2018 and for the year ended December 31, 2018:
 
As Computed under LIFO
 
As Reported under Average Cost
 
Effect of Change
Consolidated statement of operations for the year ended December 31, 2018:
 
 
 
 
 
Cost of products sold
$
5,966.7

 
$
5,911.0

 
$
(55.7
)
Income tax expense (benefit)
(19.4
)
 
(6.2
)
 
13.2

Net income
201.6

 
244.1

 
42.5

Net income attributable to AK Steel Holding Corporation
143.5

 
186.0

 
42.5

Net income per share attributable to AK Steel Holding Corporation common stockholders:
 
 
 
 
 
Basic
$
0.46

 
$
0.59

 
$
0.13

Diluted
0.45

 
0.59

 
0.14

 
 
 
 
 
 
Consolidated statement of comprehensive income for the year ended December 31, 2018:
 
 
 
 
 
Comprehensive income
$
151.0

 
$
193.5

 
$
42.5

Comprehensive income attributable to AK Steel Holding Corporation
92.9

 
135.4

 
42.5

 
 
 
 
 
 
Consolidated balance sheet as of December 31, 2018:
 
 
 
 
 
Inventory
$
1,128.7

 
$
1,419.9

 
$
291.2

Other non-current assets
180.9

 
103.9

 
(77.0
)
Other non-current liabilities
132.0

 
134.0

 
2.0

Accumulated deficit
(2,915.9
)
 
(2,691.8
)
 
224.1

 
 
 
 
 
 
Consolidated statement of cash flows for the year ended December 31, 2018:
 
 
 
 
 
Net income
$
201.6

 
$
244.1

 
$
42.5

Deferred income taxes
(21.2
)
 
(8.0
)
 
13.2

Changes in working capital
66.7

 
12.7

 
(54.0
)
Other operating items, net
4.1

 
2.4

 
(1.7
)
Property, plant and equipment Property, plant and equipment as of December 31, 2018 and 2017, consist of:
 
2018
 
2017
Land, land improvements and leaseholds
$
272.1

 
$
275.3

Buildings
509.7

 
509.0

Machinery and equipment
6,061.6

 
5,958.2

Construction in progress
125.8

 
89.3

Total
6,969.2

 
6,831.8

Less accumulated depreciation
(5,057.6
)
 
(4,845.6
)
Property, plant and equipment, net
$
1,911.6

 
$
1,986.2
Goodwill Changes in goodwill for the years ended December 31, 2018, 2017 and 2016 are presented below:
 
2018
 
2017
 
2016
Balance at beginning of year
$
253.8

 
$
32.8

 
$
32.8

Acquisition
1.2

 
221.0

 
—

Balance at end of year
$
255.0

 
$
253.8

 
$
32.8
Intangible assets Intangible assets at December 31, 2018 and 2017, consist of:
 
Gross Amount
 
Accumulated Amortization
 
Net Amount
As of December 31, 2018
 
 
 
 
 
Customer relationships
$
36.6

 
$
(7.4
)
 
$
29.2

Technology
19.3

 
(4.6
)
 
14.7

Other
1.0

 
(1.0
)
 
—

Intangible assets
$
56.9

 
$
(13.0
)
 
$
43.9

 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
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, 2018 and 2017, consist of:
 
2018
 
2017
Investments in affiliates
$
80.5

 
$
77.5

Other
23.4

 
33.3

Other non-current assets
$
103.9

 
$
110.8
Accrued liabilities Accrued liabilities as of December 31, 2018 and 2017, consist of:
 
2018
 
2017
Salaries, wages and benefits
$
127.8

 
$
101.3

Interest
34.8

 
35.0

Other
126.3

 
134.2

Accrued liabilities
$
288.9

 
$
270.5
Facility idling The supplemental unemployment and other employee benefit costs were recorded as accrued liabilities, and the activity for the years ended December 31, 2018, 2017, and 2016 was as follows:
 
 
2018
 
2017
 
2016
Balance at beginning of year
 
$
1.5

 
$
6.2

 
$
22.2

Payments
 
(1.5
)
 
(5.3
)
 
(20.1
)
Additions to the reserve
 
—

 
0.6

 
4.1

Balance at end of year
 
$
—

 
$
1.5

 
$
6.2