SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS BALANCE SHEETS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 22.3	$ 27.4	$ 28.1	$ 179.0
Other current assets	55.8	38.6
Current assets	1,972.2	1,659.1
Property and equipment, net of accumulated depreciation of $1,4 and $1.2, respectively	6,410.5	5,501.9
Accumulated depreciation	3,325.8	3,114.7
Other long-term assets	169.8	136.8
Total assets	11,243.5	10,327.4	9,983.2
Liabilities and Equity
Short-term debt	326.0	482.4
Current portion of long-term debt	100.0	313.5
Accounts payable	613.2	457.7
Other current liabilities	231.3	229.0
Current liabilities	1,622.1	1,813.3
Long-term debt	2,956.2	1,931.7
Deferred income taxes	1,390.3	1,203.8
Other long-term liabilities	136.9	135.7
Long-term liabilities	6,308.0	5,437.3
Total common shareholders’ equity	3,261.3	3,025.8
Total liabilities and equity	11,243.5	10,327.4
Integrys Energy Group, Inc.
Assets
Cash and cash equivalents	0.3	2.6	1.9	100.6
Accounts receivable from related parties	32.2	32.2
Interest Receivable from related parties	4.1	4.7
Deferred income taxes	0.6	1.0
Notes receivable from related parties	84.9	34.5
Current portion of long-term notes receivable from related parties	10.0	72.0
Other current assets	47.8	39.4
Current assets	179.9	186.4
Total investments in subsidiaries, at equity	4,268.5	3,839.3
Notes receivable from related parties	224.3	171.2
Property and equipment, net of accumulated depreciation of $1,4 and $1.2, respectively	4.5	4.7
Accumulated depreciation	1.4	1.2
Receivables from related parties	18.3	17.3
Deferred income taxes	22.3	28.1
Other long-term assets	43.9	31.7
Total assets	4,761.7	4,278.7
Liabilities and Equity
Short-term notes payable to related parties	165.7	258.0
Short-term debt	123.2	208.4
Current portion of long-term debt	100.0	0
Accounts payable to related parties	0.9	1.0
Interest payable to related parties	0	0.1
Accounts payable	1.2	0.6
Deferred income taxes	6.4	6.0
Other current liabilities	2.8	6.8
Current liabilities	400.2	480.9
Long-term debt	974.7	674.7
Deferred income taxes	110.1	81.3
Other long-term liabilities	15.4	16.0
Long-term liabilities	1,100.2	772.0
Total common shareholders’ equity	3,261.3	3,025.8
Total liabilities and equity	$ 4,761.7	$ 4,278.7