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LONG-TERM DEBT (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Disclosure of long-term debt instruments

(Millions)
 
September 30, 2013
 
December 31, 2012
WPS (1)
 
$
850.1

 
$
872.1

PGL (2)
 
770.0

 
625.0

NSG (3)
 
88.5

 
74.5

Integrys Energy Group (4)
 
1,074.8

 
674.8

Total
 
2,783.4

 
2,246.4

Unamortized discount on debt
 
(0.7
)
 
(1.2
)
Total debt
 
2,782.7

 
2,245.2

Less current portion
 
276.5

 
313.5

Total long-term debt
 
$
2,506.2

 
$
1,931.7


(1) 
In February 2013, WPS’s $22.0 million of 3.95% Senior Notes matured, and the outstanding principal balance was repaid.

In December 2013, WPS’s 4.80% Senior Notes will mature. As a result, the $125.0 million balance of these notes was included in the current portion of long-term debt on our balance sheets.

(2) 
In April 2013, PGL bought back its $50.0 million of 5.00% Series KK First and Refunding Mortgage Bonds that were due in February 2033. In the same month, PGL issued $50.0 million of 4.00% Series ZZ First and Refunding Mortgage Bonds. These bonds are due in February 2033.

In May 2013, PGL’s $75.0 million of 4.625% Series NN-2 First and Refunding Mortgage Bonds matured, and the outstanding principal balance was repaid.

In August 2013, PGL issued $220.0 million of 3.96% Series AAA First and Refunding Mortgage Bonds. These bonds are due in August 2043.

On November 1, 2013, PGL’s 7.00% Series SS First and Refunding Mortgage Bonds matured. As a result, the $45.0 million balance of these bonds was included in the current portion of long-term debt on our balance sheets.

(3) 
In May 2013, NSG’s $40.0 million of 4.625% Series N-2 First Mortgage Bonds matured, and the outstanding principal balance was repaid. In the same month, NSG issued $54.0 million of 3.96% Series Q First Mortgage Bonds. These bonds are due in May 2043.

On November 1, 2013, NSG’s 7.00% Series O First Mortgage Bonds matured. As a result, the $6.5 million balance of these bonds was included in the current portion of long-term debt on our balance sheets.

(4) 
In August 2013, we issued $400.0 million of Junior Subordinated Notes. Interest is payable quarterly at the stated rate of 6.00% for the first ten years, after which time it changes to a floating rate. These notes are due in August 2073.

In June 2014, our 7.27% Unsecured Senior Notes will mature. As a result, the $100.0 million balance of these notes was included in the current portion of long-term debt on our balance sheet at September 30, 2013.