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Long-Term Debt and Capital Lease Obligations - Long-term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
Nov. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Feb. 29, 2016
Dec. 31, 2016
Nov. 01, 2016
Oct. 01, 2016
Sep. 01, 2016
Aug. 01, 2016
Jun. 01, 2016
Feb. 01, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]                          
Long-term Pollution Control Bond $ 80.0         $ 80.0       $ 67.0      
Common Stock, Value, Issued 3.2         3.2             $ 3.2
Future maturities of our long-term debt outstanding                          
2017 154.5         154.5              
2018 836.1         836.1              
2019 357.7         357.7              
2020 684.4         684.4              
2021 336.2         336.2              
Thereafter 6,953.5         6,953.5              
Total $ 9,322.4         $ 9,322.4              
PGL Fixed First and Refunding Mortgage XX Series 2.21 Percent Bonds, Due 2016                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 2.21%         2.21%              
PGL Fixed First and Refunding Mortgage RR Series 4.3 Percent Bonds, Due 2035                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.30%         4.30%              
We Power Notes (secured, nonrecourse), 4.91% due 2015-2030                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.91%         4.91%              
We Power Notes (secured, nonrecourse), 6.00% due 2015-2033                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.00%         6.00%              
We Power Notes (secured, nonrecourse), 5.209% due 2015-2030                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 5.209%         5.209%              
We Power Notes (secured, nonrecourse), 4.673% due 2015-2031                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.673%         4.673%              
TEG Unsecured Senior Notes 8 Percent, Due 2016                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 8.00%         8.00%              
TEG Junior Subordinated Notes, 6.11% due 2066                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 3.05%         3.05%             6.11%
Debt Instrument, Basis Spread on Variable Rate           2.12%              
TEG Unsecured Senior Notes 4.17 Percent, Due 2020                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.17%         4.17%              
WEC Notes (unsecured), 6.20% due 2033                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.20%         6.20%              
WEC Junior Notes (unsecured), 6.25% due 2067                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.25%         6.25%              
Debt Instrument, Basis Spread on Variable Rate           2.1125%              
TEG Junior Subordinated Notes, 6.00% due 2073 [Member]                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.00%         6.00%              
WG | WG Debentures, 3.71% due 2046                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate                 3.71%        
Proceeds from Issuance of Debt     $ 200.0                    
PGL | PGL 3.65% Series DDD Bonds due 2046 [Member]                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate               3.65%          
Proceeds from Issuance of Debt $ 150.0                        
PGL | PGL 3.65% Series CCC Bonds due 2046 [Member]                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate             3.65%            
Proceeds from Issuance of Debt   $ 50.0                      
PGL | PGL Fixed First and Refunding Mortgage XX Series 2.21 Percent Bonds, Due 2016                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate             2.21%            
Extinguishment of Debt, Amount   $ 50.0                      
PGL | PGL Fixed First and Refunding Mortgage RR Series 4.3 Percent Bonds, Due 2035                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate                     4.30%    
Extinguishment of Debt, Amount       $ 50.0                  
We Power | We Power Notes (secured, nonrecourse), 4.91% due 2015-2030                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.91%         4.91%              
Long-term Debt, Gross $ 106.7         $ 106.7              
Long-term Debt, Current Maturities $ 5.6         $ 5.6              
We Power | We Power Notes (secured, nonrecourse), 6.00% due 2015-2033                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.00%         6.00%              
Long-term Debt, Gross $ 126.1         $ 126.1              
Long-term Debt, Current Maturities $ 4.6         $ 4.6              
We Power | We Power Notes (secured, nonrecourse), 5.209% due 2015-2030                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 5.209%         5.209%              
Long-term Debt, Gross $ 204.8         $ 204.8              
Long-term Debt, Current Maturities $ 10.8         $ 10.8              
We Power | We Power Notes (secured, nonrecourse), 4.673% due 2015-2031                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 4.673%         4.673%              
Long-term Debt, Gross $ 170.9         $ 170.9              
Long-term Debt, Current Maturities 8.5         8.5              
Integrys Holding Inc                          
Debt Disclosure [Abstract]                          
Common Stock, Value, Issued                       $ 66.4  
Integrys Holding Inc | TEG Unsecured Senior Notes 8 Percent, Due 2016                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate                     8.00%    
Unsecured Long-term Debt, Noncurrent 0.0         0.0             $ 50.0
Extinguishment of Debt, Amount       $ 50.0                  
Integrys Holding Inc | TEG Junior Subordinated Notes, 6.11% due 2066                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate                       6.11%  
Unsecured Long-term Debt, Noncurrent 114.9         $ 114.9             269.8
Debt Instrument, Basis Spread on Variable Rate           2.12%              
Debt Instrument, Repurchase Amount                       $ 128.6  
Long-term Debt, Gross 114.9         $ 114.9              
Extinguishment of Debt, Amount         $ 154.9                
Integrys Holding Inc | TEG Unsecured Senior Notes 4.17 Percent, Due 2020                          
Debt Disclosure [Abstract]                          
Unsecured Long-term Debt, Noncurrent $ 250.0         $ 250.0             250.0
Integrys Holding Inc | TEG Junior Subordinated Notes, 6.00% due 2073 [Member]                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.00%         6.00%              
Unsecured Long-term Debt, Noncurrent $ 400.0         $ 400.0             400.0
Long-term Debt, Gross 400.0         400.0              
WEC Energy Group                          
Future maturities of our long-term debt outstanding                          
2018 300.0         300.0              
2020 400.0         400.0              
Thereafter 1,200.0         1,200.0              
Total $ 1,900.0         $ 1,900.0              
WEC Energy Group | WEC Notes (unsecured), 6.20% due 2033                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.20%         6.20%              
Unsecured Long-term Debt, Noncurrent $ 200.0         $ 200.0             200.0
WEC Energy Group | WEC Junior Notes (unsecured), 6.25% due 2067                          
Debt Disclosure [Abstract]                          
Debt instrument interest rate stated percentage rate 6.25%         6.25%              
Unsecured Long-term Debt, Noncurrent $ 500.0         $ 500.0             $ 500.0