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Investment in Transmission Affiliates (Tables) - ATC
 12 Months Ended
Dec. 31, 2017
Investment in Transmission Affiliates  
Schedule of changes to our investment in ATC
The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:
 
 
2017
(in millions)
 
ATC
 
ATC Holdco
 
Total
Balance at January 1
 
$
1,443.9

 
$
—

 
$
1,443.9

Add: Earnings (loss) from equity method investment
 
166.0

 
(11.7
)
 
154.3

Add: Capital contributions
 
60.3

 
49.3

 
109.6

Less: Distributions
 
154.2

*
—

 
154.2

Less: Other
 
0.2

 
—

 
0.2

Balance at December 31
 
$
1,515.8

 
$
37.6

 
$
1,553.4


*
Of this amount, $39.9 million was recorded as a receivable from ATC in other current assets at December 31, 2017.
 
 
ATC
(in millions)
 
2016
 
2015
Balance at January 1
 
$
1,380.9

 
$
424.1

Add: Earnings from equity method investment
 
146.5

 
96.1

Add: Capital contributions
 
42.3

 
8.7

Add: Acquisition of Integrys's investment in ATC
 
(1.0
)
 
541.5

Add: Equity method goodwill from the acquisition of Integrys (1)
 
10.4

 
395.8

Less: Distributions
 
135.1

(2) 
85.1

Less: Other
 
0.1

 
0.2

Balance at December 31
 
$
1,443.9

 
$
1,380.9


(1)
Represents the purchase price allocated to Integrys's investment in ATC in excess of the recorded value.

(2) 
Of this amount, $35.2 million was recorded as a receivable from ATC in other current assets at December 31, 2016.
Schedule of significant transactions with ATC
The following table summarizes our significant related party transactions with ATC during the years ended December 31:
(in millions)
 
2017
 
2016
 
2015
Charges to ATC for services and construction
 
$
17.1

 
$
18.5

 
$
15.4

Charges from ATC for network transmission services
 
349.3

 
357.3

 
289.2

Refund from ATC per FERC ROE order
 
(28.3
)
 
—

 
—
Schedule of receivables and payables with ATC
As of December 31, 2017 and 2016, our balance sheets included the following receivables and payables related to ATC:
(in millions)
 
2017
 
2016
Accounts receivable
 
 
 
 
Services provided to ATC
 
$
1.5

 
$
2.2

Other current assets
 
 
 
 
Dividends receivable from ATC
 
39.9

 
35.2

Accounts payable
 
 
 
 
Services received from ATC
 
31.2

 
28.7
Schedule of summarized income statement data for ATC
Summarized financial data for ATC is included in the tables below:
(in millions)
 
2017
 
2016
 
2015
Income statement data
 
 
 
 
 
 
Revenues
 
$
721.7

 
$
650.8

 
$
615.8

Operating expenses
 
345.0

 
322.5

 
319.3

Other expense
 
104.1

 
95.5

 
96.1

Net income
 
$
272.6

 
$
232.8

 
$
200.4
Schedule of summarized balance sheet data for ATC
(in millions)
 
December 31, 2017
 
December 31, 2016
Balance sheet data
 
 
 
 
Current assets
 
$
87.7

 
$
75.8

Noncurrent assets
 
4,598.9

 
4,312.9

Total assets
 
$
4,686.6

 
$
4,388.7

 
 
 
 
 
Current liabilities
 
$
767.2

 
$
495.1

Long-term debt
 
1,790.6

 
1,865.3

Other noncurrent liabilities
 
240.3

 
271.5

Shareholders' equity
 
1,888.5

 
1,756.8

Total liabilities and shareholders' equity
 
$
4,686.6

 
$
4,388.7