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INFORMATION BY OPERATING SEGMENT - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues $ 813.4 $ 663.4 $ 1,375.2 $ 1,158.5  
Total Operating Revenues 813.4 663.4 1,375.2 1,158.5  
Gas Utility          
Natural and propane gas 383.7 254.3 624.5 448.1  
Operation and maintenance 143.6 98.4 241.5 197.8  
Depreciation and amortization 41.1 37.9 81.4 75.6  
Taxes, other than income taxes 58.0 48.3 94.7 81.7  
Total Gas Utility Operating Expenses 626.4 438.9 1,042.1 803.2  
Gas Marketing and other 45.2 44.1 86.2 85.8  
Total Operating Expenses 671.6 483.0 1,128.3 889.0  
Operating Income 141.8 180.4 246.9 269.5  
Net Economic Earnings (Loss) 137.2 109.0 195.1 156.5  
Total Assets 6,586.8 6,256.7 6,586.8 6,256.7 $ 6,546.7
Intersegment revenues          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 0.0 0.0 0.0 0.0  
Other          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 1.5 0.1 1.8 1.2  
Total Operating Revenues 4.4 1.8 7.2 3.6  
Gas Utility          
Natural and propane gas 0.0 0.0 0.0 0.0  
Operation and maintenance 0.0 0.0 0.0 0.0  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses 0.0 0.0 0.0 0.0  
Gas Marketing and other 6.4 2.3 10.9 4.3  
Total Operating Expenses 6.4 2.3 10.9 4.3  
Operating Income (2.0) (0.5) (3.7) (0.7)  
Net Economic Earnings (Loss) (4.7) (3.2) (9.9) (8.9)  
Total Assets 2,211.9 2,199.1 2,211.9 2,199.1 2,239.5
Other | Intersegment revenues          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 2.9 1.7 5.4 2.4  
Eliminations          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 0.0 0.0 0.0 0.0  
Total Operating Revenues (3.1) (4.3) (5.7) (9.4)  
Gas Utility          
Natural and propane gas (19.5) (21.3) (42.1) (42.0)  
Operation and maintenance (2.2) (0.9) (4.1) (2.0)  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses (21.7) (22.2) (46.2) (44.0)  
Gas Marketing and other 18.6 17.9 40.5 34.6  
Total Operating Expenses (3.1) (4.3) (5.7) (9.4)  
Operating Income 0.0 0.0 0.0 0.0  
Net Economic Earnings (Loss) 0.0 0.0 0.0 0.0  
Total Assets (1,318.0) (1,451.4) (1,318.0) (1,451.4) (1,490.2)
Eliminations | Intersegment revenues          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues (3.1) (4.3) (5.7) (9.4)  
Gas Utility | Operating Segments          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 790.6 641.1 1,332.5 1,113.4  
Total Operating Revenues 790.8 643.7 1,332.8 1,120.4  
Gas Utility          
Natural and propane gas 403.2 275.6 666.6 490.1  
Operation and maintenance 145.8 99.3 245.6 199.8  
Depreciation and amortization 41.1 37.9 81.4 75.6  
Taxes, other than income taxes 58.0 48.3 94.7 81.7  
Total Gas Utility Operating Expenses 648.1 461.1 1,088.3 847.2  
Gas Marketing and other 0.0 0.0 0.0 0.0  
Total Operating Expenses 648.1 461.1 1,088.3 847.2  
Operating Income 142.7 182.6 244.5 273.2  
Net Economic Earnings (Loss) 131.7 112.2 191.2 164.0  
Total Assets 5,484.3 5,290.8 5,484.3 5,290.8 5,551.2
Gas Utility | Operating Segments | Intersegment revenues          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 0.2 2.6 0.3 7.0  
Gas Marketing | Operating Segments          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues 21.3 22.2 40.9 43.9  
Total Operating Revenues 21.3 22.2 40.9 43.9  
Gas Utility          
Natural and propane gas 0.0 0.0 0.0 0.0  
Operation and maintenance 0.0 0.0 0.0 0.0  
Depreciation and amortization 0.0 0.0 0.0 0.0  
Taxes, other than income taxes 0.0 0.0 0.0 0.0  
Total Gas Utility Operating Expenses 0.0 0.0 0.0 0.0  
Gas Marketing and other 20.2 23.9 34.8 46.9  
Total Operating Expenses 20.2 23.9 34.8 46.9  
Operating Income 1.1 (1.7) 6.1 (3.0)  
Net Economic Earnings (Loss) 10.2 0.0 13.8 1.4  
Total Assets 208.6 218.2 208.6 218.2 $ 246.2
Gas Marketing | Operating Segments | Intersegment revenues          
Operating Segment Information [Abstract]          
Total revenues including intersegment revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0